Manifold Absolute Pressure Sensor, Checking
Use only gold-plated terminals when servicing terminals in harness connector of Manifold Absolute Pressure (MAP) Sensor -G71-.
Special Tools And Workshop Equipment Required
- Multimeter
- Wiring diagram.
Test Conditions
- The Engine Control Module (ECM) -J220- OK.
- The parking brake must be applied, otherwise daytime running lights are switched on.
- On vehicles with automatic transmission, selector lever must be in position "P" or "N".
- The ground (GND) connections between engine and body must be OK.
Function Test
-- Connect the scan tool.
-- Start engine and let it run at idle.
-- Using the scan tool, Check the specified value of the Manifold Absolute Pressure (MAP) Sensor -G71- at idle:
| Diagnostic text | Specified value | |||
|---|---|---|---|---|
| Intake manifold pressure | approx. 100 kPa | |||
If the specified value was obtained:
-- Condition is not present at this time. Check connections for loose or damaged terminals and check harness for an intermittent short.
If the specified value was Not obtained:
Test sequence
-- Disconnect the Manifold Absolute Pressure (MAP) Sensor -G71- electrical harness connector -arrow-.
-- Start the engine and run at idle speed.
-- Using a multimeter, check the Manifold Absolute Pressure (MAP) Sensor -G71- electrical harness connector terminals 1 to 3 for voltage.
Specification: 4.5 V
-- Switch the ignition off.
If the specified value was obtained:
Checking wiring
If the manufacturers test box is being used. Perform the following step.
-- Install the test box.
If the manufacturers test box is not being used. Perform the following step.
-- Remove the Engine Control Module (ECM) -J220-. Refer to the Repair Information.
-- Using a multimeter, check the Manifold Absolute Pressure (MAP) Sensor -G71- electrical harness connector terminal 4 to the Motronic Engine Control Module (ECM) -J220- electrical harness connector T60 terminal 56 for resistance.
| Manifold Absolute Pressure (MAP) Sensor -G71- electrical harness connector terminal | Motronic Engine Control Module (ECM) -J220- electrical harness connector T60 terminal or test box socket |
|---|---|
| 4 | 56 |
Specified Value: 1.5 Ohm Max.
If the specified value was Not obtained:
-- Check the wiring for an open circuit, high resistance, short circuit to each other, Battery (+), or Ground (GND).
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and the voltage supply was OK:
-- Replace Manifold Absolute Pressure (MAP) Sensor -G71-.
If the specified value of 4.5 V was Not obtained:
If the manufacturers test box is being used. Perform the following step.
-- Install the Adapter Cable (60-pin) VAG 1598/31 Refer to the Repair Information.
If the manufacturers test box is not being used. Perform the following step.
-- Remove the Engine Control Module (ECM) -J220-. Refer to the Repair Information.
-- Using a multimeter, check the Manifold Absolute Pressure (MAP) Sensor -G71- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector T60 terminals for resistance.
| Manifold Absolute Pressure (MAP) Sensor -G71- electrical harness connector terminals | Motronic Engine Control Module (ECM) -J220- electrical harness connector T60 terminals or test box sockets |
|---|---|
| 1 | 13 |
| 3 | 44 |
Specified Value: 1.5 Ω Max.
If the specified value was Not obtained:
-- Check the wiring for an open circuit, high resistance, short circuit to each other, Battery (+), or Ground (GND).
-- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
-- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring and if the voltage supply was Not OK:
-- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to the Repair Information.
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 .