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Honda Fit/Jazz - DTC Troubleshooting: P2127 (37) (With ETCS)

Online Honda Fit/Jazz 2002-2005 Workshop repair manual used by professionals.

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DTC Troubleshooting: P2127 (37)

DTC P2127: APP sensor B Circuit Low Voltage


1.Turn the ignition switch ON (II).

2.Do the DTC CLEAR in the CLEAR MENU with the HDS.

3.Turn the ignition switch OFF.

4.Turn the ignition switch ON (II).

5.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are DTC P0405 and P2127 indicated at the same time?


YES - Go to 23.


NO - Go to 6.


6.Open the throttle to full position several times.

7.Check the APP SENSOR-B in the DATA LIST with the HDS.

Is there about 0 %, or 0.62 V or less when the throttle is fully opened?


YES - Go to 8.


NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the APP sensor B and the ECM.n


8.Turn the ignition switch OFF.

9.Disconnect the APP sensor 6P connector.

10.Turn the ignition switch ON (II).

11.At the wire harness side, measure voltage between the APP sensor 6P connector terminals No. 4 and No. 6.

IMAGE REPLACED HERE

Is there about 5 V?


YES - Go to 12.


NO - Go to 19.


12.Turn the ignition switch OFF.

13.At the APP sensor side, measure resistance between the APP sensor 6P connector terminals No. 5 and No. 6.

IMAGE REPLACED HERE

Is there continuity?


YES - Go to 14.


NO - Go to 31.

14.At the APP sensor side, measure resistance between the APP sensor 6P connector terminals No. 4 and No. 5.

IMAGE REPLACED HERE

Is there about 0 W?


YES - Go to 31.


NO - Go to 15.


15.Connect the ECM test harness and the test pin box to the wire harness only, not to the ECM.

16.Check for continuity between test pin box terminal No. 79 and body ground.

Is there continuity?


YES - Repair short in the wire between the ECM connector No. 3 terminal No. 50 (test pin box terminal No. 79) and the APP sensor B, then go to 33.


NO - Go to 17.

17.Connect the APP sensor 6P connector terminal No. 5 to body ground with a jumper wire.

IMAGE REPLACED HERE


18.Check for continuity between test pin box terminal No. 79 and body ground.

Is there continuity?


YES - Go to 38.


NO - Repair open in the wire between the ECM connector No. 3 terminal No. 50 (test pin box terminal No. 79) and the APP sensor B, then go to 33.


19.Turn the ignition switch OFF, and wait 10 seconds.

20.Connect the ECM test harness and the test pin box between the ECM and connector..

21.Turn the ignition switch ON (II).

22.Measure voltage between test pin box terminals No. 32 and No. 59.

Is there about 5 V?


YES - Repair open in the wire between the ECM connector No. 3 terminal No. 3 (test pin box terminal No. 32) and the APP sensor B, then go to 33.


NO - Go to 38.

23.Turn the ignition switch OFF, and wait 10 seconds.

24.Connect the ECM test harness and the test pin box to the wire harness only, not to the ECM.

25.Disconnect the connectors from the these sensors:


26.Check for continuity between body ground and the test pin box terminals No. 32 and No. 45 individually.

Is there continuity?


YES - Repair short in the wire between the ECM connector No. 3 terminal No. 3 or No. 16 (test pin box terminal No. 32 or No. 45) and the each sensor, then go to 33.


NO - Go to 27.


27.Connect the ECM test harness to the ECM.

28.Turn the ignition switch ON (II).

29.Measure voltage between test pin box terminal No. 45 and body ground.

Is there about 5 V?


YES - Go to 30.


NO - Go to 38.


30.Continue to monitor voltage at the test pin box terminals No.45 while reconnecting the following sensors, one at a time.


Did the voltage drop to about 0 V?


YES - Replace the sensor that caused the voltage to drop, then go to 33.


NO - Go to 38.


31.Turn the ignition switch OFF.

Replace the APP sensor.

33.Reconnect all connectors.

34.Turn the ignition switch ON (II).

35.Do the ECM RESET in the CLEAR MENU with the HDS.

36.Do the ETCS learn procedure.

37.Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2127 is indicated, check for poor connections or loose terminals at the APP sensor B and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Troubleshooting is complete.n


38.Substitute a known-good ECM.

39.Check for temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?


YES - If DTC P2127 is indicated, check for poor connections or loose terminals at the APP sensor B and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.


NO - Replace the original ECM.n

NO -


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