Tech Tips
The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard voltage for that pair of terminals, displayed in the "Specified Condition" column. The illustration above can be used as a reference to identify the ECM terminal locations.
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
A28-1 (BATT) - C10-16 (E1) | Y - W-B | Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) | Ignition switch off | 11 to 16 V |
A28-2 (+B) - C10-16 (E1) | B - W-B | Power source of ECM | Ignition switch ON (IG) | 11 to 14 V |
A28-3 (+B2) - C10-16 (E1) | B - W-B | Power source of ECM | Ignition switch ON (IG) | 11 to 14 V |
C10-29 (+BM) - C10-16 (E1) | BR - W-B | Power source of throttle actuator | Ignition switch off | 11 to 16 V |
A28-37 (IGSW) - C10-16 (E1) | P - W-B | Ignition switch signal | Ignition switch ON (IG) | 11 to 14 V |
C10-75 (OC1+) - C10-74 (OC1-) | BR - GR | Camshaft timing oil control valve assembly operation signal | Idling | Pulse generation (See waveform 1) |
A28-46 (MREL) - C10-16 (E1) | GR - W-B | EFI-MAIN relay operation signal | Ignition switch ON (IG) | 11 to 14 V |
C10-91 (VG) - C10-92 (E2G) | R - L | Mass air flow meter signal | Idling, shift lever in P, A/C switch off | 0.5 to 3.0 V |
C10-90 (THA) - C10-122 (ETHA) | P - G | Intake air temperature sensor signal | Idling, intake air temperature 20°C (68°F) | 0.5 to 3.4 V |
C10-93 (THW) - C10-94 (ETHW) | L - BR | Engine coolant temperature sensor signal | Idling, engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V |
C10-115 (VCTA) - C10-116 (ETA) | W - V | Power source of throttle position sensor (specific voltage) | Ignition switch ON (IG) | 4.5 to 5.5 V |
C10-84 (VTA1) - C10-116 (ETA) | Y - V | Throttle position sensor signal (for engine control) | Accelerator pedal fully released | 0.5 to 1.1 V |
C10-83 (VTA2) - C10-116 (ETA) | GR - V | Throttle position sensor signal (for sensor malfunction detection) | Accelerator pedal fully released | 2.1 to 3.1 V |
C10-23 (HA1A) - C10-52 (E04) | G - W-B | Air fuel ratio sensor (sensor 1) heater operation signal | Idling | Pulse generation (See waveform 2) |
Ignition switch ON (IG) | 11 to 14 V | |||
C10-133 (A1A+) - C10-16 (E1) | R - W-B | Air fuel ratio sensor (sensor 1) signal | Ignition switch ON (IG) | 3.3 V* |
C10-134 (A1A-) - C10-16 (E1) | G - W-B | Air fuel ratio sensor (sensor 1) signal | Ignition switch ON (IG) | 2.9 V* |
C10-22 (HT1B) - C10-52 (E04) | L - W-B | Heated oxygen sensor (sensor 2) heater operation signal | Idling | Below 3.0 V |
Ignition switch ON (IG) | 11 to 14 V | |||
C10-103 (OX1B) - C10-135 (EX1B) | L - P | Heated oxygen sensor (sensor 2) signal | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine | Pulse generation (See waveform 3) |
C10-20 (#10) - C10-51 (E01) | GR - BR | No. 1 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C10-17 (#20) - C10-51 (E01) | P - BR | No. 2 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C10-18 (#30) - C10-51 (E01) | L - BR | No. 3 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C10-19 (#40) - C10-51 (E01) | Y - BR | No. 4 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C10-123 (KNK1) - C10-124 (EKNK) | R - G | Knock sensor signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (See waveform 5) |
C10-82 (VV1+) - C10-114 (VV1-) | L - W | Camshaft position sensor signal | Idling | Pulse generation (See waveform 6) |
C10-78 (NE+) - C10-110 (NE-) | G - R | Crankshaft position sensor signal | Idling | Pulse generation (See waveform 6) |
A28-43 (G2O) - C10-16 (E1) | B - W-B | Camshaft revolution signal | Idling | Pulse generation (See waveform 7) |
C10-57 (IGT1) - C10-16 (E1) | W - W-B | No. 1 ignition coil (No. 1 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C10-56 (IGT2) - C10-16 (E1) | V - W-B | No. 1 ignition coil (No. 2 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C10-55 (IGT3) - C10-16 (E1) | G - W-B | No. 1 ignition coil (No. 3 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C10-54 (IGT4) - C10-16 (E1) | LG - W-B | No. 1 ignition coil (No. 4 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C10-102 (IGF1) - C10-16 (E1) | Y - W-B | No. 1 ignition coil (No. 1 to No. 4 cylinder) (ignition confirmation signal) | Ignition switch ON (IG) | 4.5 to 5.5 V |
Idling | Pulse generation (See waveform 8) |
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C10-76 (PRG) - C10-51 (E01) | L - BR | Purge VSV operation signal | Ignition switch ON (IG) | 11 to 14 V |
Idling, under purge control | Pulse generation (See waveform 9) |
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C10-60 (M+) - C10-59 (ME01) | W - BR | Throttle actuator operation signal (positive terminal) |
Idling with warm engine | Pulse generation (See waveform 10) |
C10-30 (M-) - C10-59 (ME01) | B - BR | Throttle actuator operation signal (negative terminal) |
Idling with warm engine | Pulse generation (See waveform 11) |
A28-21 (FC) - C10-51 (E01) | R - BR | Fuel pump control | Ignition switch ON (IG) | 11 to 14 V |
A28-27 (W) - C10-16 (E1) | B - W-B | Malfunction Indicator Lamp (MIL) operation signal | Ignition switch ON (IG) (MIL goes on) |
Below 3.0 V |
Idling | 11 to 14 V | |||
A28-23 (TC) - C10-16 (E1) | L - W-B | Terminal TC of DLC3 | Ignition switch ON (IG) | 11 to 14 V |
A28-31 (TACH) - C10-16 (E1) | LG - W-B | Engine speed signal | Idling | Pulse generation (See waveform 12) |
A28-13 (CANH) - C10-16 (E1) | L - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 13) |
A28-26 (CANL) - C10-16 (E1) | W - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 14) |
A28-12 (CANP) - C10-16 (E1) | B - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 13) |
A28-25 (CANN) - C10-16 (E1) | W - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 14) |
A28-28 (WPI) - C10-16 (E1) | G - W-B | Engine water pump assembly signal | Idling with warm engine | Pulse generation (See waveform 15) |
A28-29 (WPO) - C10-16 (E1) | L - W-B | Engine water pump assembly signal | Idling with warm engine | Pulse generation (See waveform 16) |
C10-118 (VCPM) - C10-119 (EPIM) | P - LG | Power source of manifold absolute pressure sensor | Ignition switch ON (IG) | 4.75 to 5.25 V |
C10-87 (PIM) - C10-119 (EPIM) | B - LG | Manifold absolute pressure sensor signal | Ignition switch ON (IG) | 3.0 to 5.0 V |
C10-28 (EGR1) - C10-16 (E1) | R - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
C10-27 (EGR2) - C10-16 (E1) | G - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
C10-26 (EGR3) - C10-16 (E1) | W - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
C10-25 (EGR4) - C10-16 (E1) | Y - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
A28-45 (RFC) - C10-16 (E1) | LG - W-B | Cooling fan control | Ignition switch ON (IG), A/C switch on (max cool) | Pulse generation (See waveform 18) |
A28-50 (EC) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C10-16 (E1) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C10-51 (E01) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C10-21 (E02) - Body ground | B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C10-52 (E04) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C10-59 (ME01) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C10-58 (GE01) - Body ground | BR - - | Shielded earth (ground) circuit of throttle actuator | Always | Below 1 Ω |
Terminal No. (Symbol) | Wiring Color | Terminal Description | Condition | Specified Condition |
---|---|---|---|---|
A28-1 (BATT) - C9-16 (E1) | Y - W-B | Auxiliary battery (for measuring auxiliary battery voltage and for ECM memory) | Ignition switch off | 11 to 16 V |
A28-2 (+B) - C9-16 (E1) | B - W-B | Power source of ECM | Ignition switch ON (IG) | 11 to 14 V |
A28-3 (+B2) - C9-16 (E1) | B - W-B | Power source of ECM | Ignition switch ON (IG) | 11 to 14 V |
C9-29 (+BM) - C9-16 (E1) | BR - W-B | Power source of throttle actuator | Ignition switch off | 11 to 16 V |
A28-37 (IGSW) - C9-16 (E1) | P - W-B | Ignition switch signal | Ignition switch ON (IG) | 11 to 14 V |
C9-75 (OC1+) - C9-74 (OC1-) | BR - GR | Camshaft timing oil control valve assembly operation signal | Idling | Pulse generation (See waveform 1) |
A28-46 (MREL) - C9-16 (E1) | GR - W-B | EFI-MAIN relay operation signal | Ignition switch ON (IG) | 11 to 14 V |
C9-91 (VG) - C9-92 (E2G) | R - L | Mass air flow meter signal | Idling, shift lever in P, A/C switch off | 0.5 to 3.0 V |
C9-90 (THA) - C9-122 (ETHA) | P - G | Intake air temperature sensor signal | Idling, intake air temperature 20°C (68°F) | 0.5 to 3.4 V |
C9-93 (THW) - C9-94 (ETHW) | L - BR | Engine coolant temperature sensor signal | Idling, engine coolant temperature 80°C (176°F) | 0.2 to 1.0 V |
C9-115 (VCTA) - C9-116 (ETA) | W - V | Power source of throttle position sensor (specific voltage) | Ignition switch ON (IG) | 4.5 to 5.5 V |
C9-84 (VTA1) - C9-116 (ETA) | Y - V | Throttle position sensor signal (for engine control) | Accelerator pedal fully released | 0.5 to 1.1 V |
C9-83 (VTA2) - C9-116 (ETA) | GR - V | Throttle position sensor signal (for sensor malfunction detection) | Accelerator pedal fully released | 2.1 to 3.1 V |
C9-23 (HA1A) - C9-52 (E04) | G - W-B | Air fuel ratio sensor (sensor 1) heater operation signal | Idling | Pulse generation (See waveform 2) |
Ignition switch ON (IG) | 11 to 14 V | |||
C9-133 (A1A+) - C9-16 (E1) | R - W-B | Air fuel ratio sensor (sensor 1) signal | Ignition switch ON (IG) | 3.3 V* |
C9-134 (A1A-) - C9-16 (E1) | G - W-B | Air fuel ratio sensor (sensor 1) signal | Ignition switch ON (IG) | 2.9 V* |
C9-22 (HT1B) - C9-52 (E04) | L - W-B | Heated oxygen sensor (sensor 2) heater operation signal | Idling | Below 3.0 V |
Ignition switch ON (IG) | 11 to 14 V | |||
C9-103 (OX1B) - C9-135 (EX1B) | L - P | Heated oxygen sensor (sensor 2) signal | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine | Pulse generation (See waveform 3) |
C9-20 (#10) - C9-51 (E01) | GR - BR | No. 1 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C9-17 (#20) - C9-51 (E01) | P - BR | No. 2 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C9-18 (#30) - C9-51 (E01) | L - BR | No. 3 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C9-19 (#40) - C9-51 (E01) | Y - BR | No. 4 fuel injector assembly signal | Ignition switch ON (IG) | 11 to 14 V |
Idling | Pulse generation (See waveform 4) |
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C9-123 (KNK1) - C9-124 (EKNK) | R - G | Knock sensor signal | Engine speed maintained at 2500 rpm after warming up engine | Pulse generation (See waveform 5) |
C9-82 (VV1+) - C9-114 (VV1-) | L - W | Camshaft position sensor signal | Idling | Pulse generation (See waveform 6) |
C9-78 (NE+) - C9-110 (NE-) | G - R | Crankshaft position sensor signal | Idling | Pulse generation (See waveform 6) |
A28-43 (G2O) - C9-16 (E1) | B - W-B | Camshaft revolution signal | Idling | Pulse generation (See waveform 7) |
C9-57 (IGT1) - C9-16 (E1) | W - W-B | No. 1 ignition coil (No. 1 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C9-56 (IGT2) - C9-16 (E1) | V - W-B | No. 1 ignition coil (No. 2 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C9-55 (IGT3) - C9-16 (E1) | G - W-B | No. 1 ignition coil (No. 3 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C9-54 (IGT4) - C9-16 (E1) | LG - W-B | No. 1 ignition coil (No. 4 cylinder) (ignition signal) | Idling | Pulse generation (See waveform 8) |
C9-102 (IGF1) - C9-16 (E1) | Y - W-B | No. 1 ignition coil (No. 1 to No. 4 cylinder) (ignition confirmation signal) | Ignition switch ON (IG) | 4.5 to 5.5 V |
Idling | Pulse generation (See waveform 8) |
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C9-76 (PRG) - C9-51 (E01) | L - BR | Purge VSV operation signal | Ignition switch ON (IG) | 11 to 14 V |
Idling, under purge control | Pulse generation (See waveform 9) |
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C9-60 (M+) - C9-59 (ME01) | W - BR | Throttle actuator operation signal (positive terminal) |
Idling with warm engine | Pulse generation (See waveform 10) |
C9-30 (M-) - C9-59 (ME01) | B - BR | Throttle actuator operation signal (negative terminal) |
Idling with warm engine | Pulse generation (See waveform 11) |
A28-21 (FC) - C9-51 (E01) | R - BR | Fuel pump control | Ignition switch ON (IG) | 11 to 14 V |
A28-27 (W) - C9-16 (E1) | B - W-B | Malfunction Indicator Lamp (MIL) operation signal | Ignition switch ON (IG) (MIL goes on) |
Below 3.0 V |
Idling | 11 to 14 V | |||
A28-23 (TC) - C9-16 (E1) | L - W-B | Terminal TC of DLC3 | Ignition switch ON (IG) | 11 to 14 V |
A28-31 (TACH) - C9-16 (E1) | LG - W-B | Engine speed signal | Idling | Pulse generation (See waveform 12) |
A28-13 (CANH) - C9-16 (E1) | L - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 13) |
A28-26 (CANL) - C9-16 (E1) | W - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 14) |
A28-12 (CANP) - C9-16 (E1) | G - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 13) |
A28-25 (CANN) - C9-16 (E1) | W - W-B | CAN communication line | Ignition switch ON (IG) | Pulse generation (See waveform 14) |
A28-28 (WPI) - C9-16 (E1) | G - W-B | Engine water pump assembly signal | Idling with warm engine | Pulse generation (See waveform 15) |
A28-29 (WPO) - C9-16 (E1) | L - W-B | Engine water pump assembly signal | Idling with warm engine | Pulse generation (See waveform 16) |
C9-118 (VCPM) - C9-119 (EPIM) | P - LG | Power source of manifold absolute pressure sensor | Ignition switch ON (IG) | 4.75 to 5.25 V |
C9-87 (PIM) - C9-119 (EPIM) | B - LG | Manifold absolute pressure sensor signal | Ignition switch ON (IG) | 3.0 to 5.0 V |
C9-28 (EGR1) - C9-16 (E1) | R - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
C9-27 (EGR2) - C9-16 (E1) | G - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
C9-26 (EGR3) - C9-16 (E1) | W - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
C9-25 (EGR4) - C9-16 (E1) | Y - W-B | EGR valve assembly | EGR valve operating | Pulse generation (See waveform 17) |
A28-45 (RFC) - C9-16 (E1) | LG - W-B | Cooling fan control | Ignition switch ON (IG), A/C switch on (max cool) | Pulse generation (See waveform 18) |
A28-50 (EC) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C9-16 (E1) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C9-51 (E01) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C9-21 (E02) - Body ground | B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C9-52 (E04) - Body ground | W-B - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C9-59 (ME01) - Body ground | BR - - | Earth (ground) circuit of ECM | Always | Below 1 Ω |
C9-58 (GE01) - Body ground | BR - - | Shielded earth (ground) circuit of throttle actuator | Always | Below 1 Ω |
*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.
WAVEFORM 1
*a | 5 V/DIV. |
*b | 1 ms./DIV. |
ECM Terminal Name | Between OC1+ and OC1- |
Tester Range | 5 V/DIV., 1 ms./DIV. |
Condition | Idling |
WAVEFORM 2
*a | 5 V/DIV. |
*b | 10 ms./DIV. |
ECM Terminal Name | Between HA1A and E04 |
Tester Range | 5 V/DIV., 10 ms./DIV. |
Condition | Idling |
Tech Tips
The wavelength varies in accordance with the engine operating condition.
WAVEFORM 3
*1 | 0.2 V/DIV. |
*2 | 200 ms./DIV. |
ECM Terminal Name | Between OX1B and EX1B |
Tester Range | 0.2 V/DIV., 200 ms./DIV. |
Condition | Engine speed maintained at 2500 rpm for 2 minutes after warming up engine |
Tech Tips
In the Data List, the item O2S B1S2 shows the values input to the ECM from the heated oxygen sensor.
WAVEFORM 4
*1 | 20 V/DIV. |
*2 | 20 ms./DIV. |
ECM Terminal Name | Between #10 (to #40) and E01 |
Tester Range | 20 V/DIV., 20 ms./DIV. |
Condition | Idling |
Tech Tips
The wavelength becomes shorter as the engine speed increases.
WAVEFORM 5
*a | 1 V/DIV. |
*b | 1 ms./DIV. |
ECM Terminal Name | Between KNK1 and EKNK |
Tester Range | 1 V/DIV., 1 ms./DIV. |
Condition | Engine speed maintained at 2500 rpm after warming up engine |
Tech Tips
The wavelength becomes shorter as the engine speed increases.
The waveforms and amplitudes displayed differ slightly depending on the vehicle condition.
WAVEFORM 6
*a | 5 V/DIV. |
*b | 20 ms./DIV. |
ECM Terminal Name | CH1: Between VV1+ and VV1- CH2: Between NE+ and NE- |
Tester Range | 5 V/DIV., 20 ms./DIV. |
Condition | Idling |
Tech Tips
The wavelength becomes shorter as the engine speed increases.
WAVEFORM 7
*a | 5 V/DIV. |
*b | 20 ms./DIV. |
ECM Terminal Name | Between G2O and E1 |
Tester Range | 5 V/DIV., 20 ms./DIV. |
Condition | Idling |
Tech Tips
The wavelength becomes shorter as the engine speed increases.
WAVEFORM 8
*a | 2 V/DIV. |
*b | 20 ms./DIV. |
ECM Terminal Name | CH1: Between IGT (1 to 4) and E1 CH2: Between IGF1 and E1 |
Tester Range | 2 V/DIV., 20 ms./DIV. |
Condition | Idling |
Tech Tips
The wavelength becomes shorter as the engine speed increases.
WAVEFORM 9
*1 | 10 V/DIV. |
*2 | 20 ms./DIV. |
ECM Terminal Name | Between PRG and E01 |
Tester Range | 10 V/DIV., 20 ms./DIV. |
Condition | Idling, under purge control |
Tech Tips
If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.
WAVEFORM 10
*a | 5 V/DIV. |
*b | 1 ms./DIV. |
ECM Terminal Name | Between M+ and ME01 |
Tester Range | 5 V/DIV., 1 ms./DIV. |
Condition | Idling with warm engine |
Tech Tips
The duty ratio varies depending on the throttle actuator operation.
WAVEFORM 11
*a | 5 V/DIV. |
*b | 1 ms./DIV. |
ECM Terminal Name | Between M- and ME01 |
Tester Range | 5 V/DIV., 1 ms./DIV. |
Condition | Idling with warm engine |
Tech Tips
The duty ratio varies depending on the throttle actuator operation.
WAVEFORM 12
*a | 5 V/DIV. |
*b | 10 ms./DIV. |
ECM Terminal Name | Between TACH and E1 |
Tester Range | 5 V/DIV., 10 ms./DIV. |
Condition | Idling |
Tech Tips
The wavelength becomes shorter as the engine speed increases.
WAVEFORM 13
*a | 1 V/DIV. |
*b | 10 μs./DIV. |
ECM Terminal Name | Between CANH and E1, or CANP and E1 |
Tester Range | 1 V/DIV., 10 μs./DIV. |
Condition | Ignition switch ON (IG) |
Tech Tips
The waveform varies depending on the CAN communication signal.
WAVEFORM 14
*a | 1 V/DIV. |
*b | 10 μs./DIV. |
ECM Terminal Name | Between CANL and E1, or CANN and E1 |
Tester Range | 1 V/DIV., 10 μs./DIV. |
Condition | Ignition switch ON (IG) |
Tech Tips
The waveform varies depending on the CAN communication signal.
WAVEFORM 15
*a | 5 V/DIV. |
*b | 20 ms./DIV. |
ECM Terminal Name | Between WPI and E1 |
Tester Range | 5 V/DIV., 20 ms./DIV. |
Condition | Idling with warm engine |
Tech Tips
The wavelength becomes shorter as the engine water pump assembly speed increases.
WAVEFORM 16
*a | 5 V/DIV. |
*b | 20 ms./DIV. |
ECM Terminal Name | Between WPO and E1 |
Tester Range | 5 V/DIV., 20 ms./DIV. |
Condition | Idling with warm engine |
Tech Tips
The wavelength becomes shorter as the engine water pump assembly speed increases.
WAVEFORM 17
*1 | 20 V/DIV. |
*2 | 50 ms./DIV. |
ECM Terminal Name | Between EGR1 and E1 Between EGR2 and E1 Between EGR3 and E1 Between EGR4 and E1 |
Tester Range | 20 V/DIV., 50 ms./DIV. |
Condition | EGR valve operating |
WAVEFORM 18
*a | 1 V/DIV. |
*b | 2 ms./DIV. |
ECM Terminal Name | Between RFC and E1 |
Tester Range | 1 V/DIV., 2 ms./DIV. |
Condition | Ignition switch ON (IG), A/C switch on (max cool) |
Tech Tips
The wavelength becomes shorter as the engine coolant temperature.