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DTC B1137 P range detect SW
 
 
cautionWhen replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
If an error is detected in the P range detection switch circuit system when the vehicle speed is 10 km/h or more, OSS-ECU sets DTC B1137, and displays the immobilizer certification system inspection warning screen to the multi information display of the combination meter.
 
 
DTC SET CONDITION
Check Conditions
  • Power supply mode: ON
Judgment Criterion
  • When the vehicle speed is 10 km/h or more, 1 second or more has elapsed since the P range detection switch is detected to be OFF (selector lever is in P position).
  • When the P range detection switch is OFF, the signal other than selector lever P position is received for 2 seconds or more.
 
 
TROUBLESHOOTING HINTS
  • Damaged wiring harness or connector (short to power supply or open circuit in PDSW line)
  • Selector lever assembly malfunction (OFF seizure of P range detection switch)
  • Malfunction of the ASC-ECU
  • Malfunction of the CVT-ECU
  • Malfunction of OSS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, read other system diagnostic trouble code
(1)
cautionTo prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958).
Connect scan tool MB991958. Refer to "How to connect scan tool (M.U.T.-III) ."
(2) After performing the forced power supply output (refer to forced power supply output procedure ) "IG-ON".
(3) Check the DTC of ASC-ECU and CVT-ECU.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
<Set in ASC-ECU> : Troubleshoot the ASC-ECU (Refer to GROUP 35C - Troubleshooting ).
<Set in CVT-ECU> : Troubleshoot the CVT-ECU (Refer to GROUP 23A - Troubleshooting ).
Go to Step 2.
 
STEP 2. Check of short to power supply and open circuit in PDSW line between selector lever assembly connector and OSS-ECU connector
noteBecause the conformity cannot be determined even when the digital tester is used to measure the voltage of PDSW line between the selector lever assembly connector and OSS-ECU connector, be sure to use the oscilloscope. (Outputs the saw tooth waveform of 0 to 5 V with intervals of 10 ms.)
Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.
 
STEP 3. Check of selector lever assembly (P range detection switch)
Disconnect the selector lever assembly connector, and check the continuity at the equipment side.
 
Item No.Check itemNormal value
4 - 6Selector lever: P positionNo continuity
Selector lever: Other than P positionContinuity exists (2 Ω or less)
Is the selector lever assembly (P range detection switch) normal?
Go to Step 4.
Replace the selector lever assembly.
 
STEP 4. Using scan tool MB991958, check other system data list.
Check the OSS-ECU data list.
  • Operate the selector lever.
 
Operation stateItem No.Check itemDisplay
Selector lever: P position8P range detect SWPark position
Selector lever: Other than P positionOther than Park position
OK: Operation state and data list display agree with each other.
Is the check result normal?
Go to Step 5.
Replace the OSS-ECU and register the VIN (Refer to ).
 
STEP 5. Check whether the DTC is set again.
Is the DTC set?
Replace the OSS-ECU and register the VIN (Refer to ).
Intermittent malfunction is suspected (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).