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DTC P0791 [JA5A-EL]

BME050218901227

DTC P0791 | Intermediate sensor circuit malfunction (open/short)
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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
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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.
(See TCM REMOVAL/INSTALLATION [JA5A-EL].)
No | Go to the next step.
13 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [JA5A-EL].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [JA5A-EL].)
No | DTC troubleshooting completed.