DTC P0791 [JA5A-EL]

BME050218901227

DTC P0791

Intermediate sensor circuit malfunction (open/short)

DETECTION CONDITION

• If the rotation speed of output gear (intermediate sensor) is low when the vehicle speed and the engine speed exceed the preprogrammed value, the TCM determines that there is a malfunction.
Diagnostic support note:
• This is continuous monitor (CCM).
• The MIL illuminates if the TCM detects the above malfunction condition.
• PENDING CODE is not available.
• FREEZE FRAME DATA is available.
• The HOLD indicator light flashes.
• The DTC is stored in the TCM memory.

POSSIBLE CAUSE

• Intermediate sensor malfunction
• Short to ground in wiring harness between intermediate sensor terminal B and TCM terminal 1K
• Short to ground in wiring harness between intermediate sensor terminal A and TCM terminal 1X
• Open circuit in wiring harness between intermediate sensor terminal B and TCM terminal 1K
• Open circuit in wiring harness between intermediate sensor terminal A and TCM terminal 1X
• Damaged connectors between intermediate sensor and TCM
• TCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME PID DATA on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Bulletins and/or on-line repair information availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the available repair information.
• If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch to the LOCK position.
• Disconnect the terminal component No.2 (8-pin) connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair or replace the terminals, then go to Step 12.
4
INSPECT INTERMEDIATE SENSOR RESISTANCE
• Measure the resistance between the terminal component No.2 (8-pin) (transaxle case side).
• Is the resistance within 513-627 ohms between terminal component No.2 (8-pin) terminal C and D (transaxle case side)?
Yes
Go to the next step.
No
Go to Step 8
5
INSPECT TCM CONNECTOR FOR POOR CONNECTION
• Disconnect the TCM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair the terminals, then go to Step 12.
6
INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CIRCUIT FOR OPEN CIRCUIT
• Inspect the terminal component No.2 (8-pin) terminals (wiring harness-side) and TCM terminals (wiring harness-side).
- C and 1K
- D and 1X
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 12.
7
INSPECT TERMINAL COMPONENT NO.2 (8-PIN) CIRCUIT FOR SHORT TO GROUND
• Inspect the terminal component No.2 (8-pin) terminal (wiring harness-side) and body ground.
- C and body ground
- D and body ground
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 12.
No
Go to Step 12.
8
INSPECT COUPLER COMPONENT (8-PIN) CONNECTOR FOR POOR CONNECTION
• Disassemble the control valve body cover.
• Disconnect the coupler component (8-pin) connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair the terminals, then go to Step 12.
9
INSPECT INTERMEDIATE SENSOR RESISTANCE
• Measure the resistance between coupler component (8-pin).
• Is the resistance within 513-627 ohms between coupler component (8-pin) terminal D and C (part side)?
Yes
Repair or replace the coupler component, then go to Step 12.
No
Go to the next step.
10
INSPECT INTERMEDIATE SENSOR CONNECTOR FOR POOR CONNECTION
• Disassemble the transaxle.
• Disconnect the intermediate sensor connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Are the terminals normal?
Yes
Go to the next step.
No
Repair the terminals, then go to Step 12.
11
INSPECT INTERMEDIATE SENSOR RESISTANCE
• Measure the resistance between the intermediate sensor.
• Is the resistance within 513-627 ohms between intermediate sensor connector terminal A and B (part side)?
Yes
Repair or replace the coupler component, then go to the next step.
No
Replace the intermediate sensor, then go to the next step.
12
VERIFY TROUBLESHOOTING OF DTC P0715 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the TCM memory using the WDS or equivalent.
• Drive the vehicle at a vehicle speed of 40 km/h {25 mph} or above and engine speed 1,500 rpm or above for 2 s or more
• Repeat Step ii two times.
• Is the same DTC present?
Yes
Replace the TCM, then go to the next step.
No
Go to the next step.
13
VERIFY AFTER REPAIR PROCEDURE
• Perform the "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
DTC troubleshooting completed.