Main Relay

MAIN RELAY
For a description of the operation of the main relay, continue at "Relays" at "Description and Operation". Relays

Check Relay Operation as Follows.
1. With the ignition switch in the DRIVE position, check whether the relay has been activated by measuring the voltage across pin 2 of the Idle Air Control (IAC) valve and ground or across pin 3 of the mass air flow sensor and ground.

If voltage is present, the relay is OK if it also releases about five seconds after the ignition has been switched OFF.
If no voltage is present, proceed to step 2.

2. Lower the relay board under the dashboard and connect a jumper lead between ground and pin 85 of the relay.
Ascertain whether the relay has been activated by checking whether current is present on pin 87 of the relay.

If the relay has been activated, continue with the next step.
If the relay has not been activated, check whether voltage from maxifuse 2 is present on pins 86 and 30 of the relay.

If voltage is present, remove the relay and measure the resistance of the relay coil across pins 85 and 86. It should be about 60 ohms.
If the resistance is not OK, change the relay.

3. Check the lead between pin 85 of the relay and pin 36 of the MOTRONIC control module for continuity.
With the ignition switch in the DRIVE position, also check whether voltage from fuse 17 is present on pin 27 of the control module.

If voltage is present on pin 27 of the control module and the control module does not ground pin 36, continue at "Before Control Module Replacement" for further diagnostic instructions. Before Replacing A Control Module