P1530

DTC P1530: A/C1 Switch Circuit Intermittent

TECHNICAL DESCRIPTION
- The A/C controller sends the "ON" signal of the A/C to the ECM or PCM.
- The ECM or PCM receives the "ON" signal of the A/C sent by the A/C controller, and turns the A/C relay to "ON" position.

DTC SET CONDITIONS

Check Conditions
- Engine is running.

Judgement Criteria
- The A/C Switch repeats on-off switches 255 times per second.

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- A/C controller failed.

DIAGNOSIS
Required Special Tools:
- MB991502: Scan tool (MUT-II)




STEP 1. Using scan tool MB991958, read the diagnostic trouble code (DTC)

CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK"(OFF) position before connecting or disconnecting scan tool MB991958.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. After the DTC has been deleted, read the DTC again.
4. Turn the ignition switch to the "LOCK"(OFF) position.

Q: Is DTC P1530 set?

YES: Replace the A/C controller.
NO: It can be assumed that this malfunction is intermittent. Refer to INTRODUCTION, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions.