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7B-4 Air Conditioning System:
DTC B1556: Camshaft Position (CMP) Sensor and/or Its Circuit Malfunction
DTC Detecting Condition and Trouble Area
HVAC control module receives error code from BCM continuously.
DTC Troubleshooting
Step
1
DTC check
1) Connect scan tool to DLC with ignition switch turned
OFF.
2) Check ECM for DTC.
Is there DTC P0340?
DTC B1557: Wheel Speed Sensor and/or Its Circuit Malfunction
DTC Detecting Condition and Trouble Area
HVAC control module receives error code from BCM continuously.
DTC Troubleshooting
Step
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?
A/C System Inspection at ECM
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
Action
DTC detecting condition
Action
Trouble area
• CMP sensor circuit
• CMP sensor
• HVAC control module
Yes
Go to applicable DTC
diag. flow.
Trouble area
• Wheel speed sensor circuit
• Wheel speed sensor
• ABS/ESP® control module
• HVAC control module
Yes
Go to applicable DTC
diag. flow.
S5JB0E7204027
No
Substitute a known-
good HVAC control
module and recheck.
S5JB0E7204028
No
Substitute a known-
good HVAC control
module and recheck.
S5JB0E7204033
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Table of Contents
Troubleshooting
