What this code means

The PCM has detected a malfunction in the Manifold Absolute Pressure sensor circuit. The MAP sensor signal is outside the expected voltage range or is not correlating with other engine sensor inputs.

Symptoms

• Check Engine Light
• Poor engine performance
• Rough idle
• Black smoke from exhaust
• Poor fuel economy

Common causes

• Faulty MAP sensor
• Vacuum hose to MAP sensor disconnected or leaking
• Wiring open or short in MAP circuit
• Corroded MAP sensor connector
• PCM 5V reference voltage issue

Diagnostic steps

1. Check MAP sensor voltage at key-on engine-off (should read near barometric pressure)
2. Inspect vacuum hose to MAP sensor
3. Test MAP sensor with hand vacuum pump
4. Check 5V reference and ground circuits
5. Inspect MAP sensor connector for corrosion

Repair notes

Replace the MAP sensor if it does not respond correctly to vacuum changes.

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