Test 4: Intermittent DTCS

Inspect ground connections on back of engine. Repair as necessary. Turn ignition off. Disconnect TCM harness connector. Inspect terminals No. 53 and 57 (ground circuits) and terminal No. 56 (battery feed). Repair as necessary.
Inspect power supply circuit to transmission control relay. Repair as necessary. Inspect TCM harness connector terminal No. 11 (fused ignition switch output circuit). If all connections are okay, see INTERMITTENT DTC TCM TERMINAL PIN INSPECTION TABLE . Inspect TCM terminal pins and repair as necessary.
If procedures in steps 1) and 2) fail to diagnose problem, erase DTCs using scan tool, following scan tool manufacturer's instructions. Set reset counter equal to zero. Road test vehicle. If transmission is still not functioning properly, see SYMPTOM DIAGNOSIS under TROUBLE SHOOTING in AUTO TRANS OVERHAUL - 42LE article.

INTERMITTENT DTC TCM TERMINAL PIN INSPECTION

Intermittent DTC

TCM Terminal Pin No.

53, 56 & 57

14 & 15 ⁽¹⁾

15, 16 & 17

6 & 51

19 ⁽²⁾

4 & 43

⁽¹⁾⁽³⁾ *

2, 4, 9 & 47

9 & 50

47 & 50

9, 47 & 50

28 ⁽⁴⁾

1, 3, 41 & 42

29 ⁽⁵⁾

12 & 51

31-33 ⁽⁶⁾

9 & 47

36 ⁽⁷⁾

13, 14 & 52

37 ⁽⁸⁾

15 & 50

50-54 ⁽⁷⁾

13, 14 & 52

56-58 ⁽⁷⁾

13, 14 & 52

5 & 44

74 ⁽⁷⁾

13 & 54

76 ⁽⁹⁾

11, 53, 56 & 57

⁽¹⁾	Check transmission control relay, relay connector and TCM harness connector.

⁽²⁾	Inspect PCM terminals No. 59 and 60.

⁽³⁾	Perform TEST 20: TRANSMISSION CONTROL RELAY OUTPUT .

⁽⁴⁾	Inspect Transmission Range (TR) switch connector.

⁽⁵⁾	Inspect Throttle Position (TP) sensor connector.

⁽⁶⁾	Check for short to power.

⁽⁷⁾	Intermittent clutch or accumulator seal performance. Inspect input and output speed sensor connectors.

⁽⁸⁾	Check for a short together.

⁽⁹⁾	Intermittent in fused B+ (battery positive), ground or ignition switch output (RUN/ST) circuits.