Starter Enable Relay Circuit Diagnosis

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Engine Controls Schematics: Transaxle Range Switch Outputs:

CIRCUIT DESCRIPTION
This relay is labelled as Crank Relay in the Underhood Accessory Wiring Junction Block.

Ignition voltage is supplied directly to the Starter Enable (Crank) relay. The relay control circuit is connected through the Transaxle Range switch to the PCM. The Transaxle Range switch must be in the Park or Neutral position for the PCM to operate the relay. The Powertrain Control Module (PCM) controls the relay by grounding the control circuit via an internal solid state device called a driver. The primary function of the driver is to supply the ground for the component being controlled. Each driver has a fault line which is monitored by the PCM. When the PCM is commanding a component on, the voltage of the control circuit should be near 0 volts. When the PCM is commanding the control circuit to a component off, the voltage potential of the circuit should be near battery voltage. The status of the driver can be monitored using a scan tool. If the fault detection circuit senses a voltage other than what is expected, the driver status will change from OK to Fault.

The PCM will monitor the control circuit for the following:
^ A short to ground
^ A short to voltage
^ An open circuit
^ An open relay coil
^ An internally shorted or excessively low resistance relay coil

DIAGNOSTIC AIDS
Use the J 35616-A connector test adapter kit for any test that requires probing the PCM harness connectors, electrical center fuse/relay cavities, component terminals or a component harness connector. Using this kit will prevent damage caused by improper probing of connector terminals.

If the problem is intermittent, refer to Intermittent Conditions for diagnosis. Intermittent Conditions

Starter Enable (crank) Relay:

RELAY TERMINAL IDENTIFICATION
Use the relay cavity table in order to locate the correct cavities to probe during diagnosis. The table layout corresponds to the cavity layout in the underhood accessory junction block. Four blade relays can be inserted 2 ways. Use the table and NOT the numbering on the relay to avoid probing incorrectly.

TEST DESCRIPTION
The number below refers to the step number on the diagnostic table.
15. If no trouble is found in the control circuit or in the connection at the PCM, the PCM may be damaged. However, this is an extremely unlikely failure.