Code 4, 8 0R 9: TDC/Crank/CYL Sensor
- Turn ignition off. Remove BACK-UP (7.5-amp) fuse from underhood fuse/relay box for 10 seconds to reset ECM. Check ECM for fault codes. If Code 4, 8 or 9 is not present, problem is intermittent. Check for poor connections at ECM and distributor. Test drive vehicle and retest.
- If MIL is on and indicates Code 4, 8 or 9, turn ignition off. Disconnect 8-pin connector from TDC/CRANK/CYL sensor connector at distributor. Check resistance between terminals of each sensor. See Fig 1
. See INPUT SIGNAL & RESISTANCE TEST TERMINALS
table. If resistance is not 350-700 ohms, replace distributor sub-assembly. If resistance is 350-700 ohms, go to step 3.INPUT SIGNAL & RESISTANCE TEST TERMINALS
Sensor Code ECM Terminal Sensor Terminal CRANK 4 B15 B CRANK 4 B16 F CYL 9 B11 D CYL 9 B12 H TDC 8 B13 C TDC 8 B14 G - Check continuity to body ground on each terminal. If continuity exists, replace distributor sub-assembly. If continuity does not exist, reconnect 8-pin connector. Leaving ECM disconnected, connect ECM Test Harness (07LAJ-PT3010A ) to ECM harness connectors. Check resistance between ECM test harness terminals. See INPUT SIGNAL & RESISTANCE TEST TERMINALS table.
- If resistance is not 350-700 ohms, repair open in faulty circuit. If resistance is 350-700 ohms, check for continuity to body ground on test terminals B11, B13 and B15. If continuity exists on any terminal, repair short circuit. If continuity does not exist, replace ECM and retest.