DESCRIPTION
When the ignition switch is turned to ON, battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the EFI-MAIN NO.1 relay, closing the contact of the EFI-MAIN NO.1 relay and supplying power to terminals +B and +B2 of the ECM.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
Note
Inspect the fuses for circuits related to this system before performing the following procedure.
After turning ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.
PROCEDURE
CHECK TERMINAL VOLTAGE (IGSW VOLTAGE)
*a | Rear view of wire harness connector (to ECM) |
Disconnect the ECM connector.
Turn the ignition switch to ON.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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Result | ||||||||
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B |
CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - ECM) Click here |
C |
CHECK HARNESS AND CONNECTOR (NO. 4 INSTRUMENT PANEL RELAY BLOCK - ECM) Click here |
A |
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||
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Result | |||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
*a | Front view of wire harness connector (to Instrument Panel Junction Block Assembly) |
Disconnect the instrument panel junction block assembly connector.
Measure the voltage according to the value(s) in the table below.
Standard Voltage | ||||||
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Result | |||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
OK |
INSPECT EFI-MAIN NO. 1 RELAY
Inspect the EFI-MAIN NO. 1 relay.
Result | |||
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|
NG |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY |
OK |
CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM, BODY GROUND)
Disconnect the instrument panel junction block assembly connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | ||||||||||||||||||||||||
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Result | |||
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OK |
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
CHECK HARNESS AND CONNECTOR (IGNITION SWITCH ASSEMBLY - ECM)
Disconnect the ignition switch connector.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
INSPECT IGNITION SWITCH ASSEMBLY
Inspect the ignition switch assembly.
Result | |||
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|
OK |
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION SWITCH ASSEMBLY) |
NG |
REPLACE IGNITION SWITCH ASSEMBLY Click here |
CHECK HARNESS AND CONNECTOR (NO. 4 INSTRUMENT PANEL RELAY BLOCK - ECM)
Disconnect the ECM connector.
Remove the IG2 relay from No. 4 instrument panel relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
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NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
OK |
CHECK HARNESS AND CONNECTOR (BATTERY - NO. 4 INSTRUMENT PANEL RELAY BLOCK)
Disconnect the cable from the positive (+) battery terminal.
Remove the IG2 relay from No. 4 instrument panel relay block.
Measure the resistance according to the value(s) in the table below.
Standard Resistance | |||||||||
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Result | |||
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OK |
GO TO ENTRY AND START SYSTEM Click here |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR |