05-11
Section 05 DIGITAL PERFORMANCE MANAGEMENT (DPM) SYSTEM
Unplug upper solenoid wire (enrichment). Con-
nect a good solenoid to module output connector.
Use adaptor (P/N 529 0338 00) as required.
Disconnect engine temperature sensor connec-
tor. The DPM module now operates as though the
engine temperature was -20°C (-4°F) to allow
maximum mixture enrichment.
Start the engine and observe the solenoid. A vi-
brating solenoid indicates that the module is in
good working order. If not, replace the module
and repeat test.
Solenoid
Static Test
Disassemble the solenoid and connect it to a 12 V
battery. The solenoid must open and stay open.
Repeat test several times.
At reassembly, ensure that solenoid seals are in
place.
1. Plastic seal
2. O-rings
Dynamic test
When checking the enrichment solenoid, discon-
nect engine temperature sensor connector. The
DPM module now operates as though the engine
temperature was -20°C (-4°F) to allow maximum
mixture enrichment.
Remove the solenoid, hold it in hand and start the
engine.
For the enrichment solenoid, check if it vibrates as
soon as the engine is started.
For the compensation solenoid, the air tempera-
ture sensor must be at room temperature. Oper-
ate the engine at 3500 RPM. The solenoid must
vibrate.
Temperature Sensor (air and engine)
At room temperature 20°C (68°F), the sensor
resistance must be 2500 Ω ± 300.
-
CAUTION
Do not disconnect both DPM connectors.
The compensation solenoid must remain
plugged.
A06E2OA
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