Pinpoint Test B: One-Touch Integrated Start (OTIS) Does Not Operate Correctly

Starting System

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 Electrical Diagrams.

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 from the PCM to the starter motor relay through circuit CDC54 (WH/GN). A ground is supplied through circuit CDC12 (YE) from the PCM causing the starter motor relay coil to energize and the relay contacts close. This allows power from starter motor relay 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 customer is no longer in the loop after the initial crank request, the customer may release the key to the RUN/START position. 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:

- Wiring, terminals or connectors

- PCM

PINPOINT TEST B : One-Touch Integrated Start (OTIS) DOES NOT OPERATE CORRECTLY

B1 CHECK THE STATUS OF OTIS (OTS_STAT) PID

- Enter the following diagnostic mode on the scan tool: DataLogger- PCM.

- Monitor the OTS_STAT PID with the ignition switch in the RUN position.

Is the OTIS PID enabled?

Yes
GO to B2.

No
Enable One-Touch Integrated Start (OTIS) using the scan tool. TEST the system for normal operation. If OTIS (One-Touch Integrated Start) will not enable, INSTALL a new PCM. TEST the system for normal operation.

B2 CHECK THE KEY POSITION FOR START INDICATED (START_KEY) PID

- Monitor the START_KEY PID with the ignition switch in the START position.

Does the PID change from OFF to ON?

Yes
GO to B5.

No
GO to B3.

B3 CHECK THE START KEY CIRCUIT FOR AN OPEN

- Ignition OFF.

- Disconnect: Ignition Switch C251.

- Disconnect: Smart Junction Box C2280B.

- Measure the resistance between ignition switch C251-5, circuit CDC30 (BU/GY), harness side and smart junction box (SJB), C2280B-35, circuit CDC30 (BU/GY), harness side.





Is the resistance less than 5 ohms?

Yes
GO to B4.

No
REPAIR the circuit. TEST the system for normal operation.

B4 CHECK THE IGNITION SWITCH

- Carry out the Ignition Switch Component Test.

Did the ignition switch pass the component test?

Yes
INSTALL a new smart junction box. TEST the system for normal operation.

No
INSTALL a new ignition switch. TEST the system for normal operation.

B5 CHECK THE START CIRCUIT FOR VOLTAGE AT THE SMART JUNCTION BOX

- Ignition OFF.

- Disconnect: Smart Junction Box C2280B.

- Measure the voltage between smart junction box (SJB) C2280B-32, circuit CDC54 (WH/GN) and ground, while holding the key in the START position.





Is the voltage greater than 10 volts?

Yes
INSTALL a new smart junction box. TEST the system for normal operation.

No
REPAIR the circuit. TEST the system for normal operation.