ECD SYSTEM, Diagnostic DTC:P1169
| DTC Code | DTC Name |
|---|---|
| P1169 | Converter DC / DC Piezo Voltage Too Low, Piezo Voltage Too High |
DESCRIPTION
The DC/DC converter built into the ECM boosts the battery voltage (+12V) to 70V to activate the piezo injector.
The ECM constantly monitors the boosted voltage. If the boosted voltage deviates from the normal range, the ECM determines that the DC/DC converter is malfunctioning.
| DTC No. | DTC Detection Condition | Trouble Area | Possible to Detect | |
|---|---|---|---|---|
| Ignition Switch | Engine Run | |||
| P1169 | Either the following condition (a) or (b) is met. (a) The piezo injector voltage remains less than 40 V for 2 sec. or more. (b) The piezo injector voltage remains more than 90 V for 2 sec. or more |
|
ON | ON |
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Reference:
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The waveform between terminals #10 to #40 and PINJ1 to PINJ4 of the ECM connectors with the engine idling.
CAUTION:
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Do not reuse the injection pipe. Be sure to replace it with a new one.
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Do not reuse the injection nozzle seat. If the injector has been removed, be sure to replace the injector nozzle seat with a new one.
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The injector is controlled by a voltage of +/- 70 V.
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Be sure to connect the injector connectors correctly to prevent malfunctions in the injector.
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Do not use any power source other than the ECM for the injector.
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Do not apply voltage to the injector while it is not grounded to body.
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Do not disassemble the injector.
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Do not use the ultrasonic cleaning tool to clean the injector.
FAIL-SAFE
| DTC No. | Fail-safe Operation | Fail-safe Deactivation Condition |
|---|---|---|
| P1169 | - | - |
WIRING DIAGRAM
INSPECTION PROCEDURE
Tech Tips
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When DTC P1169 is present, check the injector voltage by selecting the following menu items on the intelligent tester: Powertrain / Engine and ECT / Data List / Inj Volt.
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If the ECM is replaced, variant coding (variant coding indicates the presence of vehicle accessory items, A/C, etc.) should always be performed Click here.
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Before removing the ECM and the peripheral parts, wait at least 3 minute after turning the ignition switch off (If the cooling fan is operating, remove the ECM and the peripheral parts after the fan stops.).
PROCEDURE
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CHECK IF ENGINE STARTS
Result Result Proceed To Engine starts A Engine does not start B
B 
CHECK BATTERY (VOLTAGE) Click here
A 
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READ VALUE OF INTELLIGENT TESTER (INJECTOR VOLTAGE)
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Connect the intelligent tester to the DLC3.
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Start the engine and turn the intelligent tester on.
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Select the following menu items: Powertrain / Engine and ECT / Inj Volt.
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Read the value.
Result Display Proceed To 40 to 90 V A Other than above B
B
CHECK BATTERY (VOLTAGE) Click here
A 
CHECK FOR INTERMITTENT PROBLEMS
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CHECK BATTERY (VOLTAGE)
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Check if the battery voltage.
Note
Carry out this check with the engine stopped and ignition switch OFF.
Standard voltage 11 to 14 V
NG 
CHARGE OR REPLACE BATTERY
OK
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INSPECT ECM (VOLTAGE)
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Disconnect the B54 ECM connector.
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Turn the ignition switch to the ON position.
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Measure the voltage according to the value(s) in the table below.
Standard voltage Tester Connection Specified Condition +B1 (B54-19) - Body ground 11 to 14 V +B2 (B54-22) - Body ground 11 to 14 V +B3 (B54-23) - Body ground 11 to 14 V
NG
CHECK AND REPAIR ECM POWER SOURCE CIRCUIT
OK
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CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
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Disconnect the A35 (A36) ECM connector.
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Measure the resistance according to the value(s) in the table below.
Standard resistance LHD Tester Connection Specified Condition GND1 (A35-28) - Body ground Below 1 Ω GND2 (A35-32) - Body ground Below 1 Ω RHD Tester Connection Specified Condition GND1 (A36-28) - Body ground Below 1 Ω GND2 (A36-32) - Body ground Below 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
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Disconnect the B53 and B54 ECM connectors.
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Measure the resistance according to the value(s) in the table below.
Standard resistance Check for open Tester Connection Specified Condition E1 (B53-38) - Body ground Below 1 Ω E2 (B54-12) - Body ground Below 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
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CHECK CONNECTOR INSTALLATION (INJECTOR)
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Check the injector connector installation.
OK The connectors are installed correctly.
NG
REPAIR OR REPLACE CONNECTOR
OK
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CHECK INJECTOR
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Disconnect the N1, N2, N3 and N4 injector connectors.
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Measure the resistance according to the value(s) in the table below.
Standard resistance Tester Connection Specified Condition 1 - 2 150 to 250 kΩ
NG
REPLACE INJECTOR (S)
OK
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CHECK HARNESS AND CONNECTOR (INJECTOR - ECM)
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Disconnect the B54 ECM connector.
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Disconnect the N1, N2, N3 and N4 injector connectors.
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Measure the resistance according to the value(s) in the table below.
Standard resistance Check for open Tester Connection Specified Condition #10 (B54-28) - Injector (No.1) (N1-1) Below 1 Ω PINJ1 (B54-29) - Injector (No.1) (N1-2) Below 1 Ω #20 (B54-25) - Injector (No.2) (N2-1) Below 1 Ω PINJ2 (B54-30) - Injector (No.2) (N2-2) Below 1 Ω #30 (B54-26) - Injector (No.3) (N3-1) Below 1 Ω PINJ3 (B54-32) - Injector (No.3) (N3-2) Below 1 Ω #40 (B54-27) - Injector (No.4) (N4-1) Below 1 Ω PINJ4 (B54-31) - Injector (No.4) (N4-2) Below 1 Ω Check for short Tester Connection Specified Condition #10 (B54-28) or Injector (No.1) (N1-1) - Body ground 10 kΩ or higher PINJ1 (B54-29) or Injector (No.1) (N1-2) - Body ground 10 kΩ or higher #20 (B54-25) or Injector (No.2) (N2-1) - Body ground 10 kΩ or higher PINJ2 (B54-30) or Injector (No.2) (N2-2) - Body ground 10 kΩ or higher #30 (B54-26) or Injector (No.3) (N3-1) - Body ground 10 kΩ or higher PINJ3 (B54-32) or Injector (No.3) (N3-2) - Body ground 10 kΩ or higher #40 (B54-27) or Injector (No.4) (N4-1) - Body ground 10 kΩ or higher PINJ4 (B54-31) or Injector (No.4) (N4-2) - Body ground 10 kΩ or higher
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM
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