C1168

Inspection 14 - ENG Speed Sig - Engine Speed Signal
DTC C1168


1. INSPECTION START





Check self-diagnosis results.

Do self-diagnosis results indicate anything other than the above?

YES >> Perform repair or replacement for the item indicated.
NO >> GO TO 2.

2. CHECK ENGINE SYSTEM







1. Perform self-diagnostic procedures for ECM.

* 1 Out of ECM diagnostic items, only P1336 CKP SENSOR (COG) causes VDC to be suspended (VDC OFF and SLIP indicators ON) and allow ABS actuator and electric unit (control unit) to indicate "ENGINE SPEED SIG".

Does the above self-diagnostic item appear on the display?

YES >> Refer to Powertrain Management.
NO >> GO TO 3.

3. CHECK CAN-LAN CONVERTER (CLC) TO ECM CIRCUIT
Do "ECM-ABS/TCS-NDC COMM NG" and/or"ABS/TCS-NDC C/U SIGNAL" (ECM self-diagnostic items)* 2 appear on display?

* 2 Items which cause VDC to be suspended (VDC OFF and SLIP indicators ON) and allow ABS actuator and electric unit (control unit) to indicate "ENGINE CHECK SIG".

YES >> Refer to "Inspection 15 ENG CHECK SIG - LAN Monitoring", "Inspection 16 LAN SIGNAL 2 - LAN Communication Start Procedure Incomplete" and, "Inspection 17 LAN COMM 1 - LAN Communication System Failure".
NO >> GO TO 4.

4. CHECK CONNECTORS
1. Disconnect CLC connector and ECM connector.
2. Check for terminal separation, looseness or bending, etc. at connector housing. If necessary, repair faulty terminals. Then reconnect them securely.
3. Perform self-diagnosis again.

Do any self-diagnosis items appear?

YES >> GO TO 5.
NO >> Check harness connectors M147, F29
Check harness for open or short between ECM connector and CLC connector If NG, repair harness or connectors.

5. CHECK LAN CIRCUIT
1. Disconnect CAN-LAN converter (CLC) connector and ECM connector.







2. Check continuity between CLC connector M147 terminal 14 (P/L) and ECM connector terminal 68 (W/G).
Continuity should exist.

OK or NG?

OK >> Connect connectors and repeat self-diagnosis. Repair or replace.
NG >> Repair harness or connectors.