2 blinks indicates a map sensor performance problem -- cause loose or poor contact on MAP sensor connector, open or short circuit in MAP Sensor WIER, or Faulty MAP sensor ... syptom is "engine operates normaly"
Trouble Shooting MAP:
First, make sure the vaccume line to the map is hooked up, its a small sensor, bottom half of the airbox, middle of the throttle assembly, very bottom
- Map sensor hose inspection -- IS THE MAP SENSOR HOSE CONNECTION CORRECT!, if yes goto step 2, if no, correct it!
- MAP Sensor Output Voltage Inspection -- I cannt fully explain this as it requires a test harness testing connections b15 + and b17- for voltage readings, should be 2.7 to 3.1v, if its not the sensor is faulty, if it is, goto step 3
- Map Sensor Output voltage at idle. -- Start the engine, check the same connections as above, is voltage is less that 2.7 volts its possible a bad ECM, if its above 2.7 its a bad MAP.
9 blinks is IAT sensor Circuit Malfunction 00 Causes: loose or poor contact on IAT sensor, Open or short circuit in IAT sensor WIRE, Faulty IAT seonsor, syptoms are a normal running engine (simulate using numerical valuse; 25c / 77f) (IAT i bellive is Intake Air Temperature, this is a sensor in the top of the air box.
IAT TROUBLE SHOOTING
- IAT Seonsor output voltage inspection, Turn the ignition to OFF, connect ECM test harness to ECM connectors, turn ignition on, measure the voltage at the test harness terminals -- b30 + and b17-
Standard volages are 2.7 - 3.1v, is the voltage within 2.7 and 3.1v if yes, intermitent failure, loose or poor contact on the ecm connectors, if no goto step 2
- IAT Sensor input voltage inspection, Turn off the ignition, diconnect the IAT sensor 2p connector, TUrn on the ignition, measure the voltage at the wireharness side of IAT sensor connector
Checking the Grey/blue - Green/Orange
Is the voltage between 4.75 and 5.25?
YEs - Goto step 3
NO - Goto step 4
- IAT Sensor resistance inspection
Turn the ignition switch off, Disconnect the IAT sensor 2p connector
Measure the resistance at the IAT Sensor terminals (do so between 20 - 30 c or 68 0 85f)
Standard measure ment would be between 1 and 4 ohms
is the resistance btween 1 - 4 ohms?
NO - Faulty IAT
YES - goto Step 4
- IAT Sensor Open Circuit Inspection
Turn the ignition switch OFF.
Chech for continuity at the gray/blue and green / orange wire between the IAT sensor 2p connector terminal and the ECP 32p (light gray) connector)
Is there continuity?
Yes - GOTO Step 5
NO - open circuit in the gray/blue or green / orange, locate and repair
- IAT sensor Output Line Shiort circuit Inspection
Check for continuity between the IAT sensor 2p annector terminal of the wireharness side and ground, check gray/blue to ground
is there continuity?
YES - SHort in gray/blue wire, find and repair
NO 0 replace the ECM with a known good one and recheck