Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.

Disconnect the MGU X2 and the SGCM X2 connectors. Refer to Generator with Starter Replacement and Generator Control Module Replacement .
Test the circuits in the SGCM to MGU Terminal Reference Table as indicated below. Also test these circuits for short to ground.
- If any of the circuits are not within specification, repair the open/high resistance or short to ground.
Reconnect MGU connector X2.
Test the circuits in the MGU to SGCM Specification Table to ground as indicated below.
- If all circuits test normal, replace the MGU.
Reconnect the MGU X2 connector and disconnect the SGCM X2 connector. Refer to Generator with Starter Replacement and Generator Control Module Replacement .
Test the circuits in the SGCM to MGU Specification Table as indicated below.
- If any of the circuits are not within the specified range, replace the SGCM.

SGCM to MGU Terminal Reference Table

MGU Connector/Terminal	SCGM Connector/Terminal	Minimum Resistance	Maximum Resistance
Harness Continuity Test
B	X2/7	-	less than 1 ohm
C	X2/6	-	less than 1 ohm
D	X2/4	-	less than 1 ohm
E	X2/17	-	less than 1 ohm
F	X2/20	-	less than 1 ohm
G	X2/19	-	less than 1 ohm
H	X2/5	-	less than 1 ohm

MGU to SGCM Specification Table

MGU Connector/Terminal	Signal Name	Minimum Resistance	Maximum Resistance
Measurements made to ground. SGCM disconnected and MGU connected.
D	REZ-	1.6k ohms	2k ohms
H	REZ+	1.6k ohms	2k ohms
C	REZ3	Over 1 M ohm	-
B	REZ4	Over 1 M ohm	-
E	REZGS (GND)	-	less than 5 ohm
G	REZ1	Over 1 M ohm	-
F	X2/5	Over 1 M ohm	-

SGCM to MGU Specification Table

SGCM Connector/Terminal	SGCM Connector/Terminal	Minimum Resistance	Maximum Resistance
MGU disconnected and SGCM connected.
X2/4	X2/5	20.1 ohms	26.7 ohms
X2/6	X2/19	32.4 ohms	43.0 ohms
X2/7	X2/20	32.9 ohms	43.5 ohms
X2/4	X2/6	Over 1 M ohm	-
X2/4	X2/7	Over 1 M ohm	-
X2/6	X2/7	Over 1 M ohm	-