Manifold Absolute Pressure Sensor, Checking
The Manifold Absolute Pressure (MAP) and Intake Air Temperature (IAT) sensors -- are located inside the same housing and cannot be serviced separately. Replacing one replaces the other.
Test requirements
- The Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
- Engine cold.
Test procedure
-- Perform a preliminary check to verify the customers complaint. Refer to PRELIMINARY CHECK .
Start diagnosis
-- Perform the function test in diagnostic mode 06. Refer to DIAGNOSTIC MODE 06 - READ TEST RESULTS FOR SPECIFIC DIAGNOSTIC FUNCTIONS .
If the specified values were not obtained:
-- Check the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector for damage, corrosion, loose or broken terminals.
| Manifold Absolute Pressure (MAP) Sensor -G71- | Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector T94 terminals or test box socket |
|---|---|
| 3 | 62 |
| 4 | 78 |
If no malfunction is detected with the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- electrical harness connector:
-- Replace the Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-. Refer to ENGINE CONTROL MODULE, REPLACING .
-- Erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
-- Perform a road test to verify repair.
Final procedures
After the repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .
End of diagnosis