Pontiac Fiero 1988 Service Manual page 1059

AIR CONDITIONING: COMPRESSOR CONTROLS
C60, MANUAL
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ISOLATION TEST (TABLE 2)
Connect: FUSED JUMPER
At: A / C COMPRESSOR CONTROL RELAY
CONNECTOR (Disconnected)
Conditions:
• Ignition Switch: RUN (Engine not
running)
• A / C Mode: NORM
• Temperature Outside Car: ABOVE 60°F
(ie°c)
Jumper
Between
Correct (Result For Diagnosis
D (BLK/
WHT)&B
(DK GRN)
Clutch
engages
Seel
• If the result is correct, do Test A.
1. Do Test Bo
A : E C M C O M P R E S S O R C O N T R O L
T E S T ( T A B L E D
Measure: VOLTAGE
At: ECM CONNECTORS CI & C2
(Disconnected)
Conditions:
• Ignition Switch: RUN (Engine not
running).
• A / C Mode: NORM
• Temperature Outside Car: ABOVE 60°F
(16°C)
• A / C Compressor Control Relay:
CONNECTED
(Continued from previous column)
Measure
Between
Correct
Voltage
For Diagnosis
C2/24
(GRY/RED) &
Ground
Battery Seel
Cl/2
(LT BLU)
& Ground
Battery See 2
C2/3
(DK
BLU) &
Ground
Battery .See 3
© If all voltages are correct, go to Table 2.
1. Check for an open in the GRY/RED (901)
wire.
2. Check for an open in the LT BLU (67) wire.
3. Check for an open in the DK BLU (458)
wire. If wire is good, replace the A/C
Compressor Control Relay.
A : E C M C O M P R E S S O R C O N T R O L
T E S T ( T A B L E 2)
Connect: FUSED JUMPER
At: ECM CONNECTOR C2 (Disconnected)
Conditions :
• Ignition Switch: RUN (Engine not
running)
• A / C Mode: NORM
• Temperature Outside Car: ABOVE 60°F
(16°C)
(Continued in next column)
(Continued from previous column)
Jumper
Between
Correct Result For Diagnosis
3
(DK
BLU) &
Ground
A/C
Compressor
Control Relay
operates and
clutch engages
Seel
• If the result is correct, but A/C System
does not operate normally, condition is due
to the ECM. Refer to Section 6E for ECM
diagnostic procedures.
1. Replace A/C Compressor Control Relay.
B: A/C COMPRESSOR CLUTCH TEST
Measure: VOLTAGE
At: A / C COMPRESSOR CLUTCH
1
CONNECTOR (Disconnected)
Conditions:
• Ignition Switch: RUN (Engine not
running)
• A / C Mode: NORM
• A / C Compressor Control Relay:
DISCONNECTED
• A / C Compressor Control Relay
Terminals B and D: JUMPERED
Measure
Between
Correct
Voltage
For Diagnosis
DK GRN
(59)
& Ground
Battery Seel
DK GRN
(59)
& BLK
(153)
Battery See 2
(Continued in next column)
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