DTC P0122

DTC P0122  : TP Sensor A Circuit Low Voltage

NOTE:  Before you troubleshoot, review the general troubleshooting information .

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   -2. Clear the DTC with the HDS.

   -3. Check the parameter (s) below with the HDS.

   Signal	Threshold		Current conditions
   	Values	Unit	Values	Unit
   TP SENSOR A	Less than 0.3	V

   Do the current condition (s) match the threshold?

   YES 

   The failure is duplicated. Go to step 2.

   NO 

   Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot .

2. Determine possible failure area (VCC3 line, THL 1 line)

   -1. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0122 TP Sensor A Circuit Low Voltage
   P0222 TP Sensor B Circuit Low Voltage

   Are DTC P0122 and P0222 indicated at the same time?

   YES 

   Go to step 4.

   NO 

   Go to step 3.

3. Shorted wire check (THL 1 line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connectors.

   PCM connector C (51P)

   Throttle body 6P connector

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	PCM connector C (51P): disconnected
   	Throttle body 6P connector: disconnected
   Test point 1	Throttle body 6P connector No. 6
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short in the THL 1 wire between the PCM (C19) and the throttle body.

   NO 

   The THL 1 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0122 goes away and the PCM was updated, troubleshooting is complete. If DTC P0122 goes away and the PCM was substituted, replace the original PCM .

4. Determine possible failure area (VCC3 line, throttle body)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Disconnect the following connector.

   Throttle body 6P connector

   -3. Turn the vehicle to the ON mode.

   -4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Throttle body 6P connector: disconnected
   Test point 1	Throttle body 6P connector No. 5
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5.0 V?

   YES 

   Replace the throttle body .

   NO 

   Go to step 5.

5. Open wire check (VCC3 line)

   -1. Turn the vehicle to the OFF (LOCK) mode.

   -2. Jump the SCS line with the HDS.

   -3. Disconnect the following connector.

   PCM connector C (51P)

   -4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Throttle body 6P connector: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	PCM connector C (51P) No. 18
   Test point 2	Throttle body 6P connector No. 5

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The VCC3 wire is OK. Update the PCM if it does not have the latest software, or substitute a known-good PCM , then recheck. If DTC P0122 goes away and the PCM was updated, troubleshooting is complete. If DTC P0122 goes away and the PCM was substituted, replace the original PCM .

   NO 

   Repair an open in the VCC3 wire between the PCM (C18) and the throttle body.