DTC P0108: MAP SENSOR CIRCUIT HIGH INPUT Isuzu Amigo II

Note. For circuit reference (Схема №1)

Circuit Description

Engine load is determined using a "speed density" method. This method is calculated using inputs from Manifold Absolute Pressure (MAP) sensor, Crankshaft Position (CKP) sensor, Intake Air Temperature (IAT) sensor and engine RPM. The MAP sensor is the main sensor used to calculate engine load. Powertrain Control Module (PCM) supplies a 5-volt reference signal and a ground circuit to MAP sensor. As manifold pressure changes, MAP sensor input voltage to PCM varies from below 2 volts at idle to above 4 volts at Wide Open Throttle (WOT). If PCM detects a MAP sensor input voltage that is excessively high, DTC P0108 will be set.

Conditions required to set DTC are

1. No TP sensor DTCs present.
2. Engine is running.
3. Throttle position is below 3% if engine speed is below 1000 RPM.
4. Throttle position is below 10% if engine speed is above 1000 RPM.
5. MAP sensor indicates manifold absolute pressure above 90 kPa for about 10 seconds.

Diagnostic Aids

Check for poor connection at PCM. Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals and poor terminal to wire connection. Inspect wiring harness for damage. Move connectors and wiring harnesses related to sensor display on scan tool. A change in display may indicate location of fault. If DTC cannot be duplicated, FAILURE RECORDS data can be used in determining vehicle mileage since DTC was last set.