Emission Control Systems: Testing and Inspection
The "Output Diagnostic Test Mode" (DTM) actuates the following components in the sequence shown:1 Fuel Injector, Cyl. 1 N30
2 Fuel Injector, Cyl. 2 N31
3 Fuel Injector, Cyl. 3 N32
4 Fuel Injector, Cyl. 4 N33
5 Fuel Injector, Cyl. 5 N83
6 Fuel Injector, Cyl. 6 N84
7 EVAP canister purge regulator valve N80
8 EGR vacuum regulator solenoid valve N18
9 Secondary Air Injection solenoid valve N11
10 Secondary Air Injection pump relay J299
Special Tools, Testers And Auxiliary Items
- VAG 1551 Scan Tool with VAG 1551/3 adaptor cable.
- VAG 1598/18 Test Box.
- VW 1594 Adapter kit.
- VAG 1527B LED Tester.
Test conditions
- Fuses 15,18 and S130 OK
- Throttle Position switch OK
NOTES:
- To activate the fuel injectors, the Throttle Position switch (in the Throttle Valve Control Module) must also be operated.
- The "Output Diagnostic Test Mode" will activate each injector 5 times via the ECM.
Work sequence
- Connect VAG 1551/VAG 1552 Scan Tool
- With ignition switched ON, press 0 and 1 buttons to select Address word 01 "engine electronics".
Display will appear as shown:
Rapid Data Transfer HELP
Select Function XX
- Operate Scan Tool taking displayed information into account
- Press 0 and 3 buttons to select Function 03 "Output Diagnostic Test Mode."
Display will appear as shown:
Rapid Data Transfer Q
03"Output Diagnostic Test Mode"
- Cylinder 1 injector N30. activating
- Press Q button to enter selection
Display will appear as shown:
"Output Diagnostic Test Mode" --->
Injector Cylinder 1-N30
- Open throttle to Wide Open position and then close completely.
- Cyl. 1 injector must click several times.
Cylinders 2 through 6 Fuel injectors, individual activation.
- Press -> button
- Open throttle to Wide Open position and then close completely.
- Cyl. 2 injector must click several times.
To skip over an individual injector.
- Press -> button
If one or more injectors do NOT click:
- Proceed with "Output Diagnostic Test Mode" until completed.
- Switch OFF ignition.
- Check Fuel injector activation (resistance and amperage supply).
EVAP canister purge regulator valve N80, activating.
- Press -> button
Display will appear as shown:
"Output Diagnostic Test Mode" --->
EVAP Canister Purge Regulator Valve-N80
- EVAP canister purge regulator valve (mounted behind coolant expansion tank) must click until the next DTM component is selected by pressing -> button.
- Disconnect EVAP canister at EVAP canister purge regulator valve.
- Attach piece of scrap hose to disconnected valve port.
- Blow into hose (in direction of Throttle Valve Control Module) during "Output Diagnostic Test Mode."
- Valve must open and close.
If valve does not open and close
- Disconnect 2-pin harness connector from N80 valve and connect VAG 1527B LED tester to disconnected connector using jumper wires from VW 1594 adaptor kit
- LED must flash
If LED flashes:
- Proceed with "Output Diagnostic Test Mode" until completed
- Switch OFF ignition
- Replace EVAP canister purge regulator valve N80.
If LED does not flash:
- Switch OFF ignition
- Connect VAG 1598/18 Test Box to ECM harness connector.
- Using wiring diagram, check for open circuit between Test Box socket 31 and terminal 1 of 2-pin harness connector
- resistance: 1.5 Ohms maximum
If wiring OK:
- Check N80 voltage supply using wiring diagram, replace ECM J220 if necessary.
EGR vacuum regulator solenoid valve N18, activating.
- Press -> button
Display will appear as shown:
"Output Diagnostic Test Mode" --->
EGR Vacuum Regulator Solenoid Valve-N18
- EGR valve must click until next DTM component is selected by pressing -> button.
If EGR valve does not click.
- Disconnect 2-pin harness connector from N18 valve and connect VAG 1527B LED tester to disconnected connector using jumper wires from VW 1594 adaptor kit.
- LED must flash
If LED flashes;
- Replace EGR vacuum regulator solenoid valve.
If LED does not flash:
- Switch OFF ignition.
- Connect VAG 1598/18 Test Box to ECM harness connector.
- Using wiring diagram, check for open circuit between Test Box. socket 30 and terminal 2 of 2-pin harness connector.
- resistance: 1.5 Ohms maximum.
If wiring OK:
- Check valve N18 voltage supply using wiring diagram, replace ECM J220 if necessary.
Secondary Air Injection solenoid valve N112, activating.
- Press -> button
Display will appear as shown:
"Output Diagnostic Test Mode" --->
Secondary Air Injection Solenoid Valve N112
- Secondary Air Injection solenoid valve must click until next DTM component is activated by pressing -> button.
If valve does not click:
- Disconnect 2-pin harness connector from N112 valve and connect VAG 1527B LED tester to disconnected connector using jumper wires from VW 1594 adaptor kit.
- LED must blink.
- Replace Secondary Air Injection solenoid valve N112.
If LED does NOT blink:
- Switch OFF ignition
- Connect VAG 1598/18 Test Box to ECM harness connector.
- Using wiring diagram, check for open circuit between Test Box socket 50 and terminal 1 of 2-pin harness connector.
- Resistance: 1.5 Ohms maximum.
If wiring OK:
- Check N112 valve voltage supply using wiring diagram, replace J220 ECM if necessary.
Secondary Air Injection pump relay J299, activating.
- Press -> button
Display will appear as shown:
"Output Diagnostic Test Mode" --->
Secondary Air Injection Pump Relay-J299
- The Secondary Air Injection pump relay J299 activates the Secondary Air Injection pump motor V101 which runs at intervals until the Output Diagnostic Test Mode" is terminated by pressing the -> button.
If motor does NOT run at intervals:
- Disconnect 2-pin harness connector from V101 motor and connect VAG 1527B LED tester to disconnected connector using jumper wires from VW 1594 adaptor kit.
- LED must blink
- Replace Secondary Air Injection pump motor V101.
If LED does NOT blink:
- Check fuse S13O.
If OK:
- Switch OFF ignition.
- Connect VAG 1598/18 Test Box to ECM harness connector.
- Remove Secondary Air Injection pump relay (arrow 1) from fuse/relay panel.
NOTE:
- If tools are required to remove relays or Control Modules from the fuse/relay panel; first disconnect the battery ground cable.
CAUTION: Obtain the radio anti-theft code before disconnecting the battery ground cable!
- Using wiring diagram, check for open circuit between Test Box socket 49 and terminal 4 of fuse/relay panel.
- Resistance: 1.5 Ohms maximum.
If wiring OK:
- Check relay voltage supply using wiring diagram, replace relay if necessary. Replace Secondary Air Injection pump relay J299 if necessary.
If relay OK:
- Replace ECM J220.
- Press -> button
Display will appear as shown:
"Output Diagnostic Test Mode" --->
EVAP Canister Purge Solenoid Valve N115
CAUTION: Disregard this display! It does not apply to this vehicle.
- Press -> button
Display will appear as shown:
Rapid Data Transfer HELP
Select Function XX
When you have completed "Output Diagnostic Test Mode" checks:
- Press 0 and 6 buttons to select Function 06 "End output."
- Press Q button to enter selection.