Acura TSX / Honda Accord CL. Manual — part 981

1. Clear the DTC with the HDS.

2. Start the engine, and shift to the D position.

3. Check that DTC P0979 recurs.

Is DTC P0979 indicated?

YES: Go to step 7 .

NO: Go to step 4.

4. Select SHIFT SOL TEST in MISC. TEST MENU, then carry out A/T SHIFT SOL C test in SHIFT SOL

TEST MENU with the HDS.

5. Start the engine, and shift to the D position.

6. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0979.

Did the result indicate a fail?

YES: Go to step 7.

NO: Intermittent failure, the system is OK at this time. Check the GRN wire for an
intermittent short to ground between the shift solenoid valve C and PCM. If the tester
indicates NOT COMPLETE, return to step 4 and recheck.

7. Turn the ignition switch OFF.

8. Jump the SCS line with the HDS.

9. Disconnect PCM connectors A (31P) and C (22P).

10. Measure the resistance between PCM connector terminals C2 and A8 or A9.

Is there less than 12 ohm?

YES: Go to step 11.

NO: Update the PCM if it does not have the latest software, or substitute a known-good
PCM (see PCM UPDATING & SUBSTITUTION FOR TESTING ), then recheck. If the
symptom/indication goes away with a known-good PCM, replace the original PCM.

troubleshoot.

z

This code is caused by an electrical circuit problem and cannot be caused
by a mechanical problem in the transmission.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 194: Measuring The Resistance Between PCM Connector Terminals C2 & A8 Or A9

11. Disconnect the shift solenoid harness connector at the transmission housing.

12. Check for continuity between PCM connector terminals C2 and A8 or A9.

Is there continuity?

YES: Repair short to ground in the wire between PCM connector terminal C2 and the shift
solenoid harness connector, then go to step 13.

NO: Check shift solenoid valve C, and check for a short in the shift solenoid harness in the
transmission (see SHIFT SOLENOID VALVE TEST ). Replace shift solenoid valve C
and/or shift solenoid harness, then go to step 13.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

Fig. 195: Checking For Continuity Between PCM Connector Terminals C2 & A8 Or A9

13. Clear the DTC with the HDS.

14. Start the engine, and shift to the D position.

15. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0979.

Did the result indicate a pass?

YES: The problem has been corrected.

NO: Return to step 1 and recheck.

DTC P0980: OPEN IN SHIFT SOLENOID VALVE C CIRCUIT

1. Clear the DTC with the HDS.

2. Start the engine in the P position.

NOTE:

z

Record all freeze data and review General Troubleshooting Information
(see GENERAL TROUBLESHOOTING INFORMATION ) before you
troubleshoot.

z

This code is caused by an electrical circuit problem and cannot be caused
by a mechanical problem in the transmission.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed

3. Check that DTC P0980 recurs.

Is DTC P0980 indicated?

YES: Go to step 7 .

NO: Go to step 4.

4. Select SHIFT SOL TEST in MISC. TEST MENU, then carry out A/T SHIFT SOL C test in SHIFT SOL

TEST MENU with the HDS.

5. Start the engine in the P position.

6. Check the OBD STATUS in DTCs MENU for a pass/fail test of code P0980.

Did the result indicate a fail?

YES: Go to step 7.

NO: Intermittent failure, the system is OK at this time. Check for poor connections or loose
terminals at the shift solenoid valve C and PCM. If the tester indicates NOT COMPLETE,
return to step 4 and recheck.

7. Turn the ignition switch OFF.

8. Jump the SCS line with the HDS.

9. Disconnect PCM connectors A (31P) and C (22P).

10. Measure the resistance between PCM connector terminals C2 and A8 or A9.

Is there 12-25 ohm?

YES: Check for loose or poor connections at PCM connector terminal C2. If the connection
is OK, update the PCM if it does not have the latest software, or substitute a known-good
PCM (see PCM UPDATING & SUBSTITUTION FOR TESTING ), then recheck. If the
symptom/indication goes away with a known-good PCM, replace the original PCM.

NO: Go to step 11.

2004 Acura TSX

2004 AUTOMATIC TRANSMISSIONS Diagnosis - MCTA 5-Speed