Table 1: | TFP Manual Valve Position Switch Logic |
Table 2: | DTC P1810 TFP Manual Valve Position Switch Circuit Malfunction |
Table 3: | Pass Conditions for DTC P1810 |
The automatic transmission fluid pressure manual valve position switch (TFP Valve Position Switch) consists of six pressure switches (three normally-closed and three normally-open switches). Ignition voltage is applied to each of the switches. By grounding or opening 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.
DTC P1810 sets during the second consecutive trip in which at least one of the following fail cases occurs:
• | The engine speed is greater than 500 RPM for 5 seconds and not in fuel shut off. |
• | The system voltage is 9-18 volts. |
• | The TFP Valve Position Switch indicates an illegal switch combination for 60 seconds. |
• | No VSS DTCs P0502 or P0503. |
• | The system voltage is 9-18 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) on 3.8L vehicles and 16 km/h (10 mph) on 3.5L vehicles. |
• | TFP Valve Position Switch indicates REVERSE, D2 or D4 for 7 seconds at engine start up without indicating PARK or NEUTRAL. |
• | No TP sensor DTCs P0121, P0122 or P0123. |
• | No VSS DTCs P0502 or P0503. |
• | No A/T ISS sensor 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 angle 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 Valve Position Switch indicates PARK or NEUTRAL for 5 seconds. |
• | No TP sensor DTCs P0121, P0122 or P0123. |
• | No VSS DTCs P0502 or P0503. |
• | No A/T ISS sensor 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 angle 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 Valve Position Switch indicates REVERSE for 7 seconds. |
• | No TP sensor DTCs P0121, P0122 or P0123. |
• | No VSS DTCs P0502 or P0503. |
• | No A/T ISS sensor 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 angle is greater than 9%. |
• | The gear ratio indicates REVERSE. |
• | The vehicle speed is more than 8 km/h (5 mph). |
• | The TFP Valve Position Switch indicates D4, D3, D2 or D1 for 5 seconds. |
• | The PCM illuminates the Malfunction Indicator Lamp (MIL). |
• | The PCM commands maximum line pressure. |
• | The PCM freezes shift adapts. |
• | The PCM assumes D4 for shifting. |
• | The PCM stores DTC P1810 in PCM history. |
• | The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes. |
• | A scan tool clears the DTC from the PCM history. |
• | The PCM clears the DTC from the PCM history if the vehicle completes 40 consecutive warm-up cycles without an emission related diagnostic fault occurring. |
• | The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM. |
• | Inspect the wiring at the PCM, the transmission 20-way connector, the 6-way TFP Valve Position Switch 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 P0705 or P0706 first, if set. |
• | Inspect the TFP Valve Position Switch seals for damage. |
• | Inspect the TFP Valve Position Switch for debris, or loose rivets. |
Gear Position | Range Signal A | Range Signal B | Range Signal C |
---|---|---|---|
Park | OFF | ON | OFF |
Reverse | ON | ON | OFF |
Neutral | OFF | ON | OFF |
D4 | OFF | ON | ON |
D3 | OFF | OFF | ON |
D2 | OFF | OFF | OFF |
D1 | ON | OFF | OFF |
Illegal | ON | OFF | ON |
Illegal | ON | ON | ON |
The numbers below refer to the step numbers on the diagnostic table.
This step tests the indicated range signal to the manual valve range actually selected.
This step tests for correct voltage from the PCM to the transmission 20-way connector.
This step tests for a short together between circuits 1224 (PNK), 1225 (DK BLU) and 1226 (RED).
Step | Action | Value(s) | Yes | No | ||||||
---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls | |||||||
2 | Perform the following inspections:
Are the inspections complete? | -- | -- | |||||||
Important: Before clearing the DTCs, use the Scan Tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear Info function will erase the stored Freeze Frame and Failure Records from the PCM. Select each transmission range: P, R, N, D4, D3, D2 and D1. Refer to the TFP Valve Position Switch Logic table. Does each selected transmission range match the Scan Tool TFP Sw. A/B/C display? | -- | Go to Diagnostic Aids | ||||||||
Is B+ displayed on all three circuits? | -- | |||||||||
5 |
Refer to General Electrical Diagnosis in Wiring Systems. Was a condition found and corrected? | -- | ||||||||
When a range signal circuit is grounded, are any other range signal circuits affected? | -- | Go to the Transmission Fluid Pressure Manual Valve Position Switch Resistance Check | ||||||||
7 | Replace the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls. Is the replacement complete? | -- | -- | |||||||
8 | Repair the affected wiring as necessary. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | -- | |||||||
9 | Perform the following procedure in order to verify the repair:
Has the test run and passed? | -- | System OK |
Pass Case 1 | Pass Case 2 | Pass Case 3 | Pass Case 4 | Pass Case 5 |
---|---|---|---|---|
The engine speed is more than 500 RPM for 5 seconds. | The engine speed starts at less than 50 RPM and rises to more than 700 RPM. | The engine speed is more than 500 RPM for 5 seconds. | ||
The engine is not in fuel shut off. | The vehicle speed is less than 5 km/h (3 mph) on 3.8L vehicles and 16 km/h (10 mph) on 3.5L vehicles. | The engine is not in fuel shut off. | ||
The system voltage is 9-18 volts. | The throttle position angle is more than 9%. | |||
The TFP Valve Position Switch indicates any legal switch combination for 60 seconds. | The TFP Valve Position Switch indicates PARK or NEUTRAL for 0.15 seconds within 7 seconds after start up. | The engine torque is 70-230 N·m (50-170 lb ft). | ||
-- | No VSS DTCs P0502 or P0503 | The vehicle speed is more than 8 km/h (5 mph). | ||
-- | -- | The gear ratio does not indicate REVERSE, D4, D3, D2 or D1. | The gear ratio indicates REVERSE. | The gear ratio indicates D4, D3, D2 or D1. |
-- | -- | The TFP Valve Position Switch indicates PARK or NEUTRAL for 1 second. | The TFP Valve Position Switch indicates REVERSE for 3 seconds. | The TFP Valve Position Switch indicates D4, D3, D2 or D1 for 1 second. |
-- | -- | No SS DTCs | ||
-- | -- | No A/T ISS DTCs | ||
-- | -- | No VSS DTCs |