[17] ENGINE AND EMISSION CONTROL - - AUTO-CRUISE CONTROL <4G64-VEHICLES WITH AUTO-CRUISE CONTROL SYSTEM> - DIAGNOSTIC TROUBLE CODE PROCEDURES - Code No.12 Vehicle speed signal system | PRINT PAGE / INDEX / PRIOR / NEXT

Code No.12 Vehicle speed signal system
DIAGNOSIS CODE SET CONDITIONS This diagnosis code is set if the vehicle speed signals from engine-A/T-ECU are not input to the auto-cruise control-ECU when the vehicle speed is 40 km/h or more.
PROBABLE CAUSES Malfunction of the connector. Malfunction of the harness. Malfunction of the engine-A/T-ECU. Malfunction of the auto-cruise control-ECU.
DIAGNOSIS PROCEDURE
STEP 1. Check the speed meter. Q: Is the check result normal? YES: Go to Step 2. NO: Check the speed meter circuit and repair or replace as required (Refer to GROUP 54A, Combination Meter Assembly - Symptom Procedures 1 <L.H. drive vehicles> or Symptom Procedures 3 <R.H. drive vehicles>). Then go to Step 5.
STEP 2. Check auto-cruise control-ECU connector C-113 and joint connector (3) C-02 <L.H. drive vehicles> or joint connector (1) C-16 <R.H. drive vehicles>. Q: Is the check result normal? YES: Go to Step 3. NO: Repair or replace connector. Then go to Step 5.
STEP 3. Check the harness between the auto-cruise control-ECU connector C-113 and joint connector (3) C-02 <L.H. drive vehicles> or joint connector (1) C-16 <R.H. drive vehicles>. Q: Is the check result normal? YES: Go to Step 4. NO: Repair harness. Then go to Step 5.
STEP 4. Check the MUT-II/III diagnosis code No. 12. Q: Is the MUT-II/III diagnosis code No. 12 set? YES: Replace the auto-cruise control-ECU (Refer to ). Then go to Step 5. NO: This malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points ).
STEP 5. Check the MUT-II/III diagnosis code No. 12. Q: Is the MUT-II/III diagnosis code No. 12 set? YES: Return to Step 1. NO: This procedure is complete.

[17] ENGINE AND EMISSION CONTROL - - AUTO-CRUISE CONTROL <4G64-VEHICLES WITH AUTO-CRUISE CONTROL SYSTEM> - DIAGNOSTIC TROUBLE CODE PROCEDURES - Code No.12 Vehicle speed signal system | PRINT PAGE / INDEX / PRIOR / NEXT

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