Pinpoint Test B: One-Touch Integrated Start (OTIS) Does Not Operate Correctly
Starting System
Pinpoint Tests
Pinpoint Test B: One-Touch Integrated Start (OTIS) Does Not Operate Correctly
Refer to Wiring Diagram Set 20, Starting System for schematic and connector information. Diagrams By Number
Normal Operation
Under normal operation, when the ignition switch is turned to the START position and released, the PCM receives a starter motor request signal through circuit CDC35 (BU/WH), power is then supplied to the starter relay through circuit CDC38 (WH/VT) from the PCM. The PCM will receive a signal from the transmission that the vehicle is in PARK or NEUTRAL through circuit CET40 (GN/OG). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter relay coil to energize and the relay contacts close. This allows power to be supplied from Battery Junction Box (BJB) fuse 13 (30A) to the relay contacts which then flows through circuit CDC25 (BN/GN) to the starter solenoid. The solenoid is grounded at the starter motor. Energizing the starter solenoid will engage the starter drive into the ring gear and closes the solenoid contacts allowing power directly from the battery through circuit SDC02 (RD) to the starter motor to start the engine. The PCM will disengage the starter motor based on engine running (rpm threshold), a set crank time has been exceeded or the ignition switch has been turned to the OFF position.
This pinpoint test is intended to diagnose the following:
- Circuitry
- PCM
PINPOINT TEST B: ONE-TOUCH INTEGRATED START (OTIS) DOES NOT OPERATE CORRECTLY
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B1 CHECK THE BATTERY
- Check the battery condition and charge. Refer to Battery, Mounting and Cables Testing and Inspection.
- Is the battery OK?
Yes
GO to B2.
No
CHARGE or INSTALL a new battery as necessary. REFER to Battery, Mounting and Cables Battery. TEST the system for normal operation.
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B2 CHECK THE PATS AND PCM FOR DTCs
- Check for Passive Anti-Theft System (PATS) and PCM DTCs.
- Were any PATS and PCM DTCs retrieved?
Yes
REFER to Anti-Theft - Passive Anti-Theft System (PATS) Testing and Inspection to diagnose the PATS DTCs. REFER to Computers and Control Systems to diagnose the PCM DTCs.
No
GO to B3.
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B3 CHECK THE STATUS OF OTIS (OTS_STAT) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
- Monitor the PCM PID OTS_STAT with the ignition switch in the RUN position.
- Is the One-Touch Integrated Start (OTIS) PID enabled?
Yes
GO to B4.
No
ENABLE OTIS. TEST the system for normal operation. If OTIS will not enable, DIAGNOSE the PCM. REFER to Computers and Control Systems.
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B4 CHECK THE KEY POSITION FOR START INDICATED (START_KEY) PID
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
- Monitor the PCM PID START_KEY with the ignition switch in the START position.
- Does the PID change from OFF to ON?
Yes
GO to B6.
No
GO to B5.
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B5 CHECK THE TR SENSOR PID
- Enter the following diagnostic mode on the scan tool: DataLogger - PCM.
- While observing the PCM Transmission Range (TR) sensor PID, place the vehicle in PARK and NEUTRAL.
- Does the PID match the gear selection?
Yes
GO to B6.
No
REFER to the Park Neutral Circuit Pinpoint Test to diagnose the transmission. REFER to Automatic Transaxle/Transmission - 6R80 Testing and Inspection.
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B6 CHECK CIRCUIT CDC35 (BU/WH) FOR AN OPEN
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
- Ignition OFF.
- Disconnect: PCM C175B.
- Disconnect: Start diode.
- Measure the resistance between start diode cell, circuit CDC35 (BU/WH) and PCM C175B-16, circuit CDC35 (BU/WH), harness side.
- Is the resistance less than 5 ohms?
Yes
DIAGNOSE the PCM. REFER to Computers and Control Systems.
No
REPAIR the circuit CDC35 (BU/WH). TEST the system for normal operation.
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