[23A] AUTOMATIC TRANSMISSION (FF) - - TROUBLESHOOTING <A/T> - SYMPTOM PROCEDURES - Inspection Procedure 19: Abnormal Shift Indicator Display <4G63, 4G64> | PRINT PAGE / INDEX / PRIOR / NEXT

Inspection Procedure 19: Abnormal Shift Indicator Display <4G63, 4G64>
OPERATION The engine-A/T-ECU detects the shift range (sport mode) which the driver has selected, and sends the information to the combination meter.
COMMENTS ON TROUBLE SYMPTOM The cause is probably a malfunction of the shift switch assembly, combination meter and engine-A/T-ECU.
PROBABLE CAUSES Malfunction of shift switch assembly Malfunction of the combination meter Damaged harness wires and connectors Malfunction of the engine-A/T-ECU
DIAGNOSIS PROCEDURE
STEP 1. MUT-II/III data list Item 67: Select switch Item 68: Upshift switch Item 69: Downshift switch Check the above data list (Refer to data list reference table ). Q: Is the check result normal? YES: Go to Step 2. NO: Refer to inspection procedure 18: Shift switch assembly system .
STEP 2. Measure the voltage at engine-A/T-ECU connector C-109. Confirm the shift range by using the Actuator test on the MUT-II/III, and measure the voltage at the ECU terminals. Ignition switch: ON
Item No. | Gear shift position | Measured terminals
Between terminal 117 and earth | Between terminal 118 and earth | Between terminal 105 and earth
09 | 3rd | 8 - 10 V | 8 - 10 V | 1 V or less
10 | 4th | 1 V or less | 1 V or less | 8 - 10 V
Q: Is the check result normal? YES: Go to Step 4. NO: Go to Step 3.
STEP 3. Connectors check: C-109 engine-A/T-ECU connector, C-105 intermediate connector, C-04 combination connector Check for the contact with terminals. Q: Is the check result normal? YES: Replace the engine-A/T-ECU. NO: Repair the defective connector.
STEP 4. Measure the voltage at combination meter connector C-04. Remove the combination meter. Confirm the shift range by using the Actuator test on the MUT-II/III, and measure the voltage at the combination meter harness-side connector terminals. Ignition switch: ON
Item No. | Gear shift position | Measured terminals
Between terminal 50 and earth | Between terminal 51 and earth | Between terminal 52 and earth
09 | 3rd | 8 - 10 V | 8 - 10 V | 1 V or less
10 | 4th | 1 V or less | 1 V or less | 8 - 10 V
Q: Is the check result normal? YES: Go to Step 7. NO: Go to Step 5.
STEP 5. Connectors check: C-04 combination meter connector, C-105 intermediate connector, C-109 engine-A/T-ECU connector Check for the contact with terminals. Q: Is the check result normal? YES: Go to Step 6. NO: Repair the defective connector.
STEP 6. Check the harness between combination meter connector C-04 terminal No.50, 51, 52 and engine-A/T-ECU connector C-109 terminal No.117, 118, 105. Check the output line for short-circuited or open circuit. Q: Is the check result normal? YES: Replace the engine-A/T-ECU. NO: Repair the wiring harness.
STEP 7. Connector check: C-04 combination meter connector Check for the contact with terminals. Q: Is the check result normal? YES: Replace the combination meter. NO: Repair the defective connector.

[23A] AUTOMATIC TRANSMISSION (FF) - - TROUBLESHOOTING <A/T> - SYMPTOM PROCEDURES - Inspection Procedure 19: Abnormal Shift Indicator Display <4G63, 4G64> | PRINT PAGE / INDEX / PRIOR / NEXT

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