Test NS-1A - Checking For Faults & Spark

NOTE: For connector terminal identification, see CONNECTOR IDENTIFICATION . For appropriate wiring diagram, see WIRING DIAGRAMS at end of article.

Ensure battery is fully charged. Using DRB-II, erase faults and reset adaptive memory. Try to start engine by cranking for at least 10 seconds. Ensure ignition is turned off before each attempt to start engine. Turn ignition switch to ON position. Read faults using DRB-II. See DRB-II FAULT MESSAGES table.

DRB-II FAULT MESSAGES

DTC

DRB-II Message

Test No.

Code 25

AUTOMATIC IDLE SPEED MOTOR CIRCUITS

NS-6A

Code 42

AUTO SHUTDOWN RELAY CONTROL CIRCUIT

NS-10A

Code 53

CONTROLLER FAILURE SPI COMMUNICATIONS

⁽¹⁾

Code 22 & 24

COOLANT VOLTAGE & TPS VOLTAGE HIGH

⁽²⁾

Code 43

IGNITION CONTROL CIRCUIT

NS-5A

Code 27

INJECTOR CONTROL CIRCUIT

NS-5A

Code 53

INTERNAL CONTROLLER FAILURE

⁽¹⁾

Code 42

NO ASD RELAY VOLTAGE SENSE AT CONTROLLER

NS-11A

Code 42

NO REFERENCE SIGNAL DURING CRANKING

NS-9A

NO RESPONSE

NS-8A

⁽¹⁾	Replace SBEC. Perform VERIFICATION PROCEDURE VER-1.

⁽²⁾	Repair open Black/Light Blue wire at SBEC connector terminal No. 4 to coolant temperature sensor. Perform VERIFICATION PROCEDURE VER-1.

If DRB-II displays no faults, turn ignition switch from OFF to ON position. Read Direct Ignition System (DIS) sensor display. DO NOT crank engine before reading DIS crankshaft position sensor display. If DRB-II displays CRANK ONLY, replace DIS crankshaft position sensor. Perform VERIFICATION PROCEDURE VER-1.
If CAM ONLY is displayed, replace DIS camshaft position sensor. Perform VERIFICATION PROCEDURE VER-1. If CAM ONLY is not displayed, crank engine. Observe DRB-II display. If CRANK and CAM are not displayed, perform TEST NS-9A.
If CRANK and CAM are displayed, try to start engine by cranking engine for at least 10 seconds. Ensure ignition switch is turned to OFF position before each attempt to start engine. If engine starts and then stalls, perform TEST NS-2A. If engine does not start, turn ignition switch to OFF position.
CAUTION: If spark plug cable is held more than 1/4" away from a good .... ground, SBEC damage may occur.
Disconnect any spark plug cable at spark plug. Insert an insulated screwdriver in cable terminal. Hold screwdriver no more than 1/4" from a good ground. Watch for spark while cranking engine for 10 seconds. If a good spark occurs, perform TEST NS-2A. If a good spark does not occur, reconnect spark plug cable. Disconnect another spark plug cable at spark plug, and repeat test.
If a good spark occurs, replace spark plug cable which was initially used to test for spark. Perform TEST NS-2A. If a good spark does not occur, perform TEST NS-5A.