Code 4, 8, 0R 9: TDC/Crank/CYL Sensor
- Turn ignition off. Remove BACK-UP fuse (10-amp) 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, distributor and connector C308 at left shock tower. Test drive vehicle and retest.
- If MIL is on and indicates Code 4, 8 or 9, turn ignition off. Disconnect 6-pin connector from TDC/CRANK/CYL sensor connector at cylinder head. Check resistance between terminals of each sensor. See Fig 1
. See INPUT SIGNAL & RESISTANCE TEST TERMINALS
table. If resistance is not 650-850 ohms, replace sensor assembly. See REMOVE/INSTALL/OHAUL
article. If resistance is 650-850 ohms, go to step 3.INPUT SIGNAL & RESISTANCE TEST TERMINALS
Sensor Code ECM Terminal Sensor Terminal CRANK 4 B15 E CRANK 4 B16 B CYL 9 B11 F CYL 9 B12 C TDC 8 B13 D TDC 8 B14 A - Check continuity to body ground on each terminal. If continuity exists, replace sensor assembly. See REMOVE/INSTALL/OHAUL article in this section. If continuity does not exist, reconnect 6-pin connector. Connect ECM Test Harness (07LAJ-PT3010A ) to ECM harness connectors, leaving ECM disconnected. Check resistance between terminals of each sensor at ECM test harness. See INPUT SIGNAL & RESISTANCE TEST TERMINALS table.
- If resistance is not 650-850 ohms, repair open in faulty circuit. If resistance is 650-850 ohms, check for continuity to body ground on test terminals B11 and B13. If continuity exists on any terminal, repair short circuit. If continuity does not exist, replace ECM and retest.