DTC Troubleshooting: P1888 (36-1)

DTC P1888:  Problem in CVT Speed Sensor Circuit

NOTE: Record all freeze data before you troubleshoot.

1.Check whether the DTC for manifold absolute pressure (MAP) sensor is indicated.

Is the DTC for MAP sensor indicated?


YES - Perform the MAP sensor troubleshooting, and recheck for DTC P1888 after troubleshooting.


NO - Go to 2.


2.Turn the ignition switch OFF.

3.Check for continuity between PCM connector terminal A23 and body ground, and between terminal A24 and body ground.

 

Are there continuity?


YES - Go to 4.


NO - Repair open in the wire PCM connector terminals A23 and A24, and ground (G101), or repair poor ground (G101).n


4.Disconnect CVT speed sensor connector.

5.Turn the ignition switch ON (II).

6.Measure the voltage between CVT speed sensor connector terminal No. 1 and body ground.

 

Is there about 5 V?


YES - Go to 7.


NO - Go to 19.


7.Turn the ignition switch OFF.

8.Disconnect the battery negative terminal.

9.Disconnect PCM connector C (22P).

10.Check for continuity between CVT speed sensor connector terminal No. 2 and body ground.

 

Is there continuity?


YES - Repair short to ground in the wire between PCM connector C22 and the CVT speed sensor connector.n


NO - Go to 11.

11.Check for continuity between CVT speed sensor connector terminal No. 3 and body ground.

 

Is there continuity?


YES - Go to 12.


NO - Repair open in the wire between the CVT speed sensor connector terminal No. 3 and ground (G101), or repair poor ground (G101).n


12.Reconnect PCM connector C (22P), then reconnect the battery negative terminal.

13.Turn the ignition switch ON (II).

14.Measure the voltage between CVT speed sensor connector terminals No. 2 and No. 3.

 

Is there about 5 V?


YES - Go to 15.


NO - Go to 24.

15.Connect CVT speed sensor connector.

16.Measure the voltage between PCM connector terminals C22 and A23 or A24.

 

Is there about 0 V or 5 V?


YES - Go to 17.


NO - Replace the  CVT speed sensor.n


17.Lift up the vehicle, and allow the wheels to rotate freely.

18.With driving the vehicle, measure the voltage between PCM connector terminals C22 and A23 or A24.

 

Is there 1.5-3.5 V?


YES - Update the PCM if it does not have the latest software, or subsutitute a known-good PCM, then recheck. If the symptom/ indication goes away with a known-good  PCM, replace the original PCM.n


NO - Replace the  CVT speed sensor.n

19.Measure the voltage between PCM connector terminals A21 and A23 or A24.

 

Is there 4.75-5.25 V?


YES - Repair open in the wire between PCM connector terminal A21 and the CVT speed sensor connector.n


NO - Go to 20.


20.Turn the ignition switch OFF.

21.Disconnect the battery negative terminal.

22.Disconnect PCM connector A (31P).

23.Check for continuity between PCM connector terminal A21 and body ground.

 

Is there continuity?


YES - Repair short to ground in the wire between PCM connector terminal A21 and the CVT speed sensor connector.n


NO - Update the PCM if it does not have the latest software, or subsutitute a known-good PCM, then recheck. If the symptom/ indication goes away with a known-good  PCM, replace the original PCM.n

24.Measure the voltage between PCM connector terminals C22 and A23 or A24.

 

Is there about 5 V?


YES - Repair open in the wire between PCM connector terminal C22 and the CVT speed sensor connector.n


NO - Update the PCM if it does not have the latest software, or subsutitute a known-good PCM, then recheck. If the symptom/ indication goes away with a known-good  PCM, replace the original PCM.n