Main Relay Operation Inspection - Mazda CX-7 2007 Workshop Manual

SYMPTOM TROUBLESHOOTING [L3 WITH TC]
VSS
1. Measure the #1 PCM terminal voltage and confirm that it is at 0 V or 5 V when the ignition switch to the ON
position and the engine is idling.
• If it is at 0 V or 5 V, intermittent concern exists. (See01-03-76 INTERMITTENT CONCERN
TROUBLESHOOTING[L3 WITH TC].)
• If not, inspect the following points concerning the PCM connector.
• If there is no problem, inspect for the following:
— Female terminal opening is loose.
— Coupler (pin holder) damage
— Pin discoloration (blackness)
— Wiring harness/pin crimp is loose or disconnected.
2. Measure the #2 sensor terminal voltage and confirm that it is at 0 V or 5 V when the ignition switch to the ON
position and the engine is idling.
• If it is at 0 V or 5 V, intermittent concern exists. (See01-03-76 INTERMITTENT CONCERN
TROUBLESHOOTING[L3 WITH TC].)
• If not, inspect the following points concerning the sensor connector:
• If there is no problem, inspect for the following.
— Female terminal opening is loose.
— Coupler (pin holder) damage
— Pin discoloration (blackness)
— Wiring harness/pin crimp is loose or disconnected.
3. Confirm that the #3 terminal switch voltage is at 0 V.
• If it is at 0 V, inspect the sensor. If necessary, replace the sensor.
— If necessary, replace the sensor.
• If not, inspect for the following:
— Open circuit in wiring harness
— Female terminal opening is loose.
— Coupler (pin holder) damage
— Pin discoloration (blackness)
— Wiring harness/pin crimp is loose or disconnected.

Main Relay Operation Inspection

1. Verify that the main relay clicks when the ignition switch is turned to ON position and then off.
• If there is no operation sound, inspect the following:
— Main relay (See09-21-4 RELAY INSPECTION.)
— Wiring harness and connector between ignition switch and main relay terminal A.
— Wiring harness and connector between PCM terminal 1AT and main relay terminal B.
PCM
INPUT
1 2
3
01-03
acxuuw00002367
01-03–81