Test 13B - No Bus Bias

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION. For wiring diagrams, see article in ENGINE PERFORMANCE:

WIRING DIAGRAMS - 2.5L TBI
WIRING DIAGRAMS - 2.5L FLEXIBLE FUEL
WIRING DIAGRAMS - 3.0L
After each repair, perform TEST VER-1 .

CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.

NOTE: Ignition off during bus test is most common cause for this trouble code.
1. This test applies to AA body only. If ignition was off during BUS test, turn ignition on, engine off. If ignition was on during BUS test, disconnect scan tool. Using an external voltmeter, check voltage between chassis ground and Data Link Connector (DLC) terminal No. 6 (Violet/Brown wire). If voltage is not 2.3-2.6 volts, go to step 3).
2. If voltage is 2.3-2.6 volts, check voltage between chassis ground and DLC terminal No. 4 (White/Black wire). If voltage is not 2.3-2.6 volts, go to next step. If voltage is 2.3-2.6 volts, replace scan tool cable or cartridge as necessary.
3. If vehicle is not equipped with 41TE transaxle, go to TEST 13K . If vehicle is equipped with 41TE transaxle, disconnect Transmission Control Module (TCM). TCM is located on left side of engine compartment, near cowl.
4. Using an external ohmmeter, check resistance between TCM terminals No. 5 and 44. If resistance is not 100-140 ohms, replace TCM.
5. If resistance is 100-140 ohms, check resistance of Violet/Brown wire between TCM connector terminal No. 43 and DLC connector terminal No. 6. If resistance is more than 5 ohms, repair open Violet/Brown wire.
6. If resistance is less than 5 ohms, check resistance of White/Black wire between TCM connector terminal No. 4 and DLC connector terminal No. 4. If resistance is more than 5 ohms, repair open White/Black wire.
7. If resistance is less than 5 ohms, check resistance of Violet/Brown wire between TCM connector terminals No. 5 and No. 43. If resistance is more than 5 ohms, repair open Violet/Brown wire.
8. If resistance is less than 5 ohms, check resistance of White/Black wire between TCM connector terminals No. 4 and No. 44. If resistance is less than 5 ohms, repair open White/Black wire.
9. If resistance is less than 5 ohms, reconnect scan tool. Using scan tool in voltmeter mode, check voltage on PCM connector terminal No. 11 (Dark Blue wire). If voltage is less than 10 volts, repair open Dark Blue wire.
10. If voltage is more than 10 volts, turn ignition off. Using scan tool in ohmmeter mode, check resistance of PCM connector terminal No. 57 (Black/Red wire). If resistance is more than 5 ohms, repair open Black/Red wire. If resistance is less than 5 ohms, replace TCM.