P1810

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION

The Automatic Transmission Fluid Pressure Manual Valve Position switch (TFP Val. Position Sw.) consists of six pressure switches (three normally-closed and three normally-open switches). Ignition voltage is applied to each of the switches. By grounding one or more of these switches with fluid pressure from the manual valve, the PCM can detect which gear range is selected.

If the PCM detects an illegal combination on any range inputs (ON/OFF/ON or ON/ON/ON), then DTC P1810 sets. If the PCM detects a gear range other than the one indicated, then DTC P1810 sets. DTC P1810 is a Type B DTC.

CONDITIONS FOR SETTING THE DTC

One of the following fail cases must be true:

Case 1

^ The engine speed is greater than 500 RPM for 5 seconds, and not in fuel shut off.

^ The system voltage is 9-16 volts.

^ The TFP Val. Position Sw. indicates an illegal switch combination for 60 seconds.

Case 2

^ No VSS DTCs P0502 or P0503.

^ The system voltage is 9-16 volts.

^ The engine speed starts at less than 50 RPM and rises to more than 700 RPM.

^ The vehicle speed is less than 5 km/h (3 mph)

^ TFP Val. Position Sw. indicates Reverse, D2 or D4 for 7 seconds during and after start up without indicating Park/Neutral.

Case 3

^ No TP DTCs P0121, P0122 or P0123.

^ No VSS DTCs P0502 or P0503.

^ No Automatic Transmission Input (Shaft) Speed Sensor (A/T ISS) DTCs P0716 or P0717 are set.

^ No 1-2 Shift Solenoid Valve (1-2 SS Valve) DTCs P0751 or P0753.

^ No 2-3 Shift Solenoid Valve (2-3 SS Valve) DTCs P0756 or P0758.

^ The engine torque is 70-230 N.m (50-170 lb ft).

^ The engine speed is greater than 500 RPM for 5 seconds, and not in fuel shut off.

^ The throttle position is greater than 9%.

^ The gear ratio indicates Reverse, D4, D3, D2 or D1.

^ The vehicle speed is more than 8 km/h (5 mph).

^ The TFP Val. Position Sw. indicates Park/Neutral for 5 seconds.

Case 4

^ No TPS DTCs P0121, P0122 or P0123.

^ No VSS DTCs P0502 or P0503.

^ No A/T ISS DTCs P0716 or P0717 are set.

^ No 1-2 SS valve DTCs P0751 or P0753.

^ No 2-3 SS valve DTCs P0756 or P0758.

^ The engine torque is 70-230 N.m (50-170 lb. ft).

^ The engine speed is more than 500 RPM for 5 seconds, and not in fuel shut off.

^ The throttle position is greater than 9%.

^ The gear ratio indicates D4, D3, D2 or D1.

^ The vehicle speed is greater than 8 km/h (5 mph).

^ The TFP Val. Position Sw. indicates Reverse for 7 seconds.

Case 5

^ No TPS DTCs P0121, P0122 or P0123.

^ No VSS DTCs P0502 or P0503.

^ No A/T ISS DTCs P0716 or P0717 are set.

^ No 1-2 SS valve DTCs P0751 or P0753.

^ No 2-3 SS valve DTCs P0756 or P0758.

^ The engine torque is 70-230 N.m (50-170 lb. ft).

^ The engine speed is greater than 500 RPM for 5 seconds, and not in fuel shut off.

^ The throttle position is greater than 9%.

^ The gear ratio indicates Reverse.

^ The vehicle speed is more than 8 km/h (5 mph).

^ The TFP Val. Position Sw. indicates D4, D3, D2 or D1 for 5 seconds.

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp (MIL).

^ The PCM commands maximum line pressure.

^ The PCM disables shift adapts.

^ The PCM assumes D4 for shifting.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns OFF the MIL after three consecutive trips without a failure reported.

^ A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported.

^ The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM.

DIAGNOSTIC AIDS

^ Inspect the wiring at the PCM, the transmission 20-way connector, the 6-way TFP Val. Position Sw. connector and all other circuit connecting points for the following conditions:

- A bent terminal

- A backed out terminal

- A damaged terminal

- Poor terminal tension

- A chafed wire

- A broken wire inside the insulation

- Moisture intrusion

- Corrosion

^ When diagnosing for an intermittent short or open, massage the wiring harness while watching the test equipment for a change.

^ If a transmission overhaul was performed, ensure that the transmission fluid is at the proper level. A low fluid condition may set this DTC.

^ Diagnose DTC 1520 first, if set.

^ Inspect the TFP Val. Position Sw. seals for damage.

^ Inspect the TFP Val. Position Sw. for debris, or loose rivets.

TEST DESCRIPTION

The numbers below refer to the step numbers on the Diagnostic Table.

3. This step tests the indicated range signal to the manual valve actually selected.

4. This step tests for correct voltage from the PCM to the transmission 20-way connector.