Test sequence
- Remove engine cover -arrows-.
- Disconnect 4-pin connector -1- from ignition coil -2-.
- Connect multimeter as follows to measure voltage.
IGNITION COIL POWER SUPPLY: CONNECTOR TERMINAL 1
| Connector terminal | Measure to |
|---|---|
| 1 | Engine ground (GND) |
- Switch ignition on.
- Specified value: approx. battery voltage (B+)
If specified value is not obtained:
- Switch ignition off.
- Remove rubber seal of plenum chamber cover in direction of -arrow-.
- Remove plenum chamber cover -1- from front.
- Pry off both trim caps -3- with a screwdriver.
- Loosen hex nuts -4- several turns.
- Release wiper arms -2- from pivot shaft by tilting them slightly.
- Remove hex nuts completely and remove wiper arms.
- Remove retaining clips -1- and remove air cowl grille -5-.
- Remove cover for electronics box (plenum chamber) -arrows-.
- Lift off ECM retaining clip using a screwdriver -arrow- and move module to side.
- If installed, unclip Transmission Control Module (TCM) retaining clip and move module to one side.
- Disconnect power supply relay -2-.
- Check for open circuit in the following wiring according to wiring diagram:
POWER SUPPLY RELAY CIRCUIT CHECK: CONNECTION OF IGNITION COILS TERMINAL 1
| Relay carrier in electronics box, plenum chamber, position 2 terminal | Connection of ignition coils. terminal |
|---|---|
| 8 | 1 |
- Repair open circuit, if necessary.
- Check voltage supply of Motronic ECM power supply relay -J271-. See CHECKING POWER SUPPLY .
- Check activation of Motronic ECM power supply relay -J271-. See CHECKING ACTIVATION .
If the wiring is OK: