Passat Syncro Wagon V6-2.8L (ATQ) (2000)
Engine Control Module: Testing and Inspection
Operating Conditions of Engine, Checking
Operating Conditions of Engine, Checking
NOTE: This test determines whether the Engine Control Module (ECM) recognizes the engine operating conditions of idle, overrun, partial throttle,
enrichment, and full throttle.
Special tools and equipment
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V.A.G 1551 Scan Tool (or VAG 1552 mobile scan tool) with VAG 1551/3 cable
Test condition
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Coolant temperature must be at least 80 °C, See Display group 04, display field 3
Test sequence
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Connect V.A.G 1551 scan tool (VAG 1552). Start engine and select Engine Control Module (ECM) using address word 01 (connecting scan tool
and selecting ECM). See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Scan Tool
Connecting/With Manufacturer's Scan Tool/Connecting VAG 1551 Scan Tool
Indicated on display
Rapid data transfer
HELP
Select function XX
-
Press 0 and 8 of function "Read Measuring Value Block", and then press Q to exit from input mode.
Indicated on display
Read Measuring Value Block
Input display group number XXX
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Press 0, 0 and 5 for the function "display group number 5", and then press Q to exit from input mode.
Indicated on display (1 - 4 = display fields)
Read Measuring Value Block 5
->
1
2
3
4
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Check if control module recognizes operating conditions (display field 4).
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Idle: (as long as the engine is idling, "idle" should be indicated)
Display: Idle
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Deceleration mode:
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Increase engine speed to above 3000 RPM.
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Then abruptly close throttle valve (as long as engine speed is over 1400 RPM, "Deceleration mode" should be indicated).
Display: Deceleration
NOTE: Below 1400 RPM idle will be recognized again.
-
Partial throttle:
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Hold gas pedal steady (as long as gas pedal is held steady, "partial throttle" should be indicated).
Display: Partial throttle
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Enrichment:
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Open throttle all the way (as far as throttle valve goes).
Acceleration enrichment should be briefly indicated
Display: Enrich