For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
1 |

1. Install the J 39775 jumper harness on the transmission side of the 20-way connector, if needed.
2. Using the J 39200 digital multimeter (DMM) and J 35616-A connector test adapter kit, measure the resistance from terminal U to the transmission case.

Is the resistance less than the value shown?

50 ohms

Go to Step 3

Go to Step 2

2 |

1. Disconnect the internal transmission harness from the TFP manual valve position switch.
2. Measure the resistance from terminal D to the TFP manual valve position switch housing.

Is the resistance less than the value shown?

50 ohms

Go to Step 15

Go to Step 17

3 | Measure the resistance from terminal N to the transmission case. Is the resistance more than the value shown? | 50 K ohms | Go to Step 5 | Go to Step 4
4 |

1. Disconnect the internal transmission harness from the TFP manual valve position switch.
2. Measure the resistance from terminal A to the TFP manual valve position switch housing.

Is the resistance more than the value shown?

50 K ohms

Go to Step 15

Go to Step 17

5 | Measure the resistance from terminal R to the transmission case. Is the resistance more than the value shown? | 50 K ohms | Go to Step 7 | Go to Step 6
6 |

1. Disconnect the internal transmission harness from the TFP manual valve position switch.
2. Measure the resistance from terminal B to the TFP manual valve position switch housing.

Is the resistance more than the value shown?

50 K ohms

Go to Step 15

Go to Step 17

7 | Measure the resistance from terminal P to the transmission case. Is the resistance more than the value shown? | 50 K ohms | Go to Step 9 | Go to Step 8
8 |

1. Disconnect the internal transmission harness from the TFP manual valve position switch.
2. Measure the resistance from terminal C to the TFP manual valve position switch housing.

Is the resistance more than the value shown?

50 K ohms

Go to Step 15

Go to Step 17

9 |

1. Start the engine and let the engine idle.
2. Set the parking brake
3. Place the gear selector in PARK (P).
4. Measure the resistance from terminal U to the transmission case.

Is the resistance more than the value shown?

50 K ohms

Go to Step 10

Go to Step 17

10 |

1. Place the gear selector in REVERSE (R).
2. Measure the resistance from terminal P to the transmission case.

Is the resistance less than the value shown?

50 ohms

Go to Step 11

Go to Step 17

11 |

1. Place the gear selector in DRIVE (D4).
2. Measure the resistance from terminal N to the transmission case.

Is the resistance less than the value shown?

50 ohms

Go to Step 12

Go to Step 17

12 | Measure the resistance from terminal R to the transmission case. Is the resistance less than the value shown? | 50 ohms | Go to Step 13 | Go to Step 17
13 |

1. Place the gear selector in Low (D1).
2. Measure the resistance from terminal N to the transmission case.

Is the resistance less than the value shown?

50 ohms

Go to Step 14

Go to Step 17

14 | Measure the resistance from terminal P to the transmission case. Is the resistance less than the value shown? | 50 ohms | System OK | Go to Step 17
15 | Inspect for high resistance:

• | Inspect the transmission wiring for poor electrical connections at the transmission 20-way connector and at the TFP manual valve position switch connector.

• | Look for possible bent, backed out, deformed, or damaged terminals.

• | Inspect for reduced terminal tension.

Was the condition found?

--

Go to Step 1

Go to Step 16

16 | Replace the internal wiring harness. Refer to Wire Harness Disconnect and Wiring Harness Removal in the 4T40-E/4T45-E Section of the Transmission Unit Repair Manual. Is the replacement complete? | -- | Go to Step 1 | --
17 | Replace the TFP manual valve position switch. Refer to Transmission Fluid Pressure (TFP) Switch Removal in the 4T40-E/4T45-E Section of the Transmission Unit Repair Manual. Is the replacement complete? | -- | Go to Step 1 | --