7B-4 Air Conditioning System:
DTC B1556: Camshaft Position (CMP) Sensor and/or Its Circuit Malfunction
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DTC Detecting Condition and Trouble Area
DTC Troubleshooting
DTC B1557: Wheel Speed Sensor and/or Its Circuit Malfunction
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DTC Detecting Condition and Trouble Area
DTC Troubleshooting
A/C System Inspection at ECM
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Voltage Check
When checking voltage at ECM terminals related to A/C system, refer to “Inspection of ECM and Its Circuits: in
Section 1A”.
DTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • CMP sensor circuit
• CMP sensor
• HVAC control module
Step Action Yes No
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Is there DTC P0340?
Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
DTC detecting condition Trouble area
HVAC control module receives error code from BCM continuously. • Wheel speed sensor circuit
• Wheel speed sensor
• ABS/ESP® control module
• HVAC control module
Step Action Yes No
1 DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ABS/ESP® control module for DTC.
Is there DTC C1021, C1022 / C1025, C1026 / C1031,
C1032 / C1035, C1036?
Go to applicable DTC
diag. flow.
Substitute a known-
good HVAC control
module and recheck.
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