Output Diagnostic Test Mode (DTM) (Function 03)
OUTPUT DIAGNOSTIC TEST MODE (FUNCTION 03)
The output DTM actuates the following components in the stated sequence:
1 - Injector, Cyl. 1 N30
2 - Injector, Cyl. 2 N31
3 - Injector, Cyl. 3 N32
4 - Injector, Cyl. 4 N33
5 - Idle air control valve N71
6 - EVAP canister purge regulator valve N80
7 - Heated Oxygen Sensor (HO2S) relay
8 - EGR vacuum regulator solenoid valve N18
9 - Secondary Air Injection (AIR) relay J299
Special tools, testers and auxiliary items
- VAG 1551 scan tool with VAG 1551/3 adapter cable
- VAG 1598 test box
- VW 1594 connector test kit
- VAG 1527B voltage tester
Test conditions
- Throttle Position (TP) sensor G69 OK
- Fuse 18 OK
Test sequence
- Connect VAG 1551 scan tool.
- Ignition switched on
- Press buttons -0- and -1- to insert "Engine Electronics" address word 01. Scan Tool Connecting and Initial Checks
- Press -Q- button to confirm input.
Indicated on display
Rapid data transfer HELP
Select function XX
- Operate VAG 1551 scan tool taking into account the information on the display:
- Press buttons -0- and -3- to insert "Output Diagnostic Test Mode" function 03.
Indicated on display
Rapid data transfer Q
03 - Output Diagnostic Test Mode
NOTE: If something different is indicated on the display:
See VAG 1551 scan tool operating instructions.
Activate Cyl. 1 fuel injector N30:
- Press -Q- button to confirm input.
Indicated on display
Output Diagnostic Test Mode ->
Injector, Cyl.1-N30
If something different is displayed:
- Press -> button repeatedly until "Select function XX" is displayed.
- Again select "Output Diagnostic Test Mode" function 03 and confirm with -Q- button.
- Open throttle valve fully and close again.
- Cyl. 1 fuel injector must click
NOTE: All fuel injectors click extremely quietly!
To activate fuel injectors for Cyl. 2 through Cyl. 4, in each case:
- Open throttle valve fully again and close.
To skip individual tests:
- Press -> button.
If one or more fuel injectors do not click:
- Continue output diagnostic test mode to the end.
- Switch ignition off.
Checking fuel injector actuation (resistance and current supply), refer to "Fuel Injectors, Checking". Testing and Inspection
Activate idle air control valve N71:
- Press-> button.
Indicated on display
Output Diagnostic Test Mode ->
Idle Air Control valve-N71
- Idle air control valve must click, until switching to next component test by pressing -> button.
If idle air control valve does not click:
- Disconnect harness connector from valve.
- Connect diode test lamp VAG 1527 to terminals 1 and 2 of detached connector, using adapter cables from VW 1594 test kit.
If LED flashes:
- Replace idle air control valve.
If LED does not flash:
- Switch ignition off.
- Connect VAG 1598 test box to ECM wiring harness.
- Check wiring between test box and 2-pin connector for open circuit according to wiring diagram.
- Connector terminal 1 to socket 27
- Connector terminal 2 to socket 53
- Wire resistance: Max. 1.5 Ohms
- Check wiring between ECM connector and 2-pin connector terminal 2 for short to terminal 1 and/or chassis ground, according to wiring diagram.
- Connector terminal 2 to socket 27
- Specification: Infinity Ohms (no continuity)
- Also check wiring for short to battery positive voltage (B+).
- Specification: Infinity Ohms (no continuity)
If no malfunction in wire is detected:
- Reconnect harness connector to valve.
- Replace Motronic ECM J220.
Activate EVAP canister purge regulator valve N80:
- Press -> button.
Indicated on display
Output Diagnostic Test Mode ->
EVAP canister purge regulator valve N80
- EVAP Canister Purge Regulator Valve N80 must click, until switching to next component test by pressing -> button.
- Disconnect hose from valve N80 (from EVAP canister).
- Connect auxiliary hose.
- During test, blow into hose (in direction of throttle housing).
- Valve must open and close
If valve does not open and close:
- Disconnect 2-pin connector from valve and connect diode test lamp VAG 1527 to disconnected connector, using adapter cables from VW 1594 test kit.
- LED must flash
If LED flashes:
- Replace EVAP canister purge regulator valve N80.
If LED does not flash:
- Switch ignition off.
- Connect VAG 1598 test box to ECM wiring harness.
- Check wiring for open circuit between test box and 2-pin connector, according to wiring diagram.
- Terminal 1 to socket 31
- Specification: Infinity Ohms (no continuity)
- Check wiring for open circuit between 2-pin connector terminal 2 and central electrics, according to wiring diagram.
- Wire resistance: Max. 1.5 Ohms
- Check wiring between ECM connector and 2-pin connector terminal 1 for short to terminal 2 and/or chassis ground, according to wiring diagram.
- Connector terminal 2 to socket 31
- Specification: Infinity Ohms (no continuity)
- Also check wiring for short to battery positive voltage (B+).
- Specification: Infinity Ohms (no continuity)
If no malfunction in wire is detected:
- Reconnect connector to valve.
- Replace Motronic ECM J220.
Activate Heated Oxygen Sensor (HO2S) relay J278:
- Press -> button.
Indicated on display
Output Diagnostic Test Mode ->
Heated Oxygen Sensor Relay-J278
- The oxygen sensor heating relay (on auxiliary relay panel) must click, until switching to next component test by pressing -> button
If relay does not click:
- Switch ignition off.
- Check HO2S relay J278 according to wiring diagram.
If an open circuit cannot be located:
- Replace HO2S relay J278 or Motronic ECM J220 as necessary.
Activate EGR vacuum regulator solenoid valve N18:
- Press -> button.
Indicated on display
Output Diagnostic Test Mode ->
EGR Vac. Regulator Solenoid Valve - N18
- EGR vacuum regulator solenoid valve N18 (two-way valve) must click.
If valve does not click:
- Disconnect 2-pin connector from valve and connect diode test lamp VAG 1527 to disconnected connector, using adapter cables from VW 1594 test kit.
If LED flashes:
- Replace EGR vacuum regulator solenoid valve N18.
If LED does not flash:
- Switch ignition off.
- Connect VAG 1598 test box to ECM wiring harness.
- Check wiring for open circuit between test box and 2-pin connector terminal 2, according to wiring diagram.
- Connector terminal 2 to socket 30
- Wire resistance: Max. 1.5 Ohms
- Check wiring for open circuit between 2-pin connector terminal 1 and central electrics, according to wiring diagram.
- Wire resistance: Max. 1.5 Ohms
- Check wiring between ECM connector and 2-pin connector terminal 2 for short to terminal 1 and/or chassis ground, according to wiring diagram.
- Connector terminal 1 to socket 30
- Specification: Infinity Ohms (no continuity)
- Also check wiring for short to battery positive voltage (B+).
- Specification: Infinity Ohms (no continuity)
If no malfunction in wire is detected:
- Reconnect connector to valve.
- Replace Motronic ECM J220.
- Press -> button.
Indicated on display
Output Diagnostic Test Mode ->
Intake Manifold Change-over Valve-N156
- Ignore display.
Activate Secondary Air Injection (AIR) pump relay J299:
- Press -> button.
Indicated on display
Output Diagnostic Test Mode ->
Secondary Air Injection Pump Relay-J299
The AIR pump pump relay J299 activates the AIR solenoid valve N112 and the AIR pump motor V101.
If the motor does not run:
- Disconnect 2-pin harness connector from AIR pump motor V101.
- Connect diode test lamp VAG 1527 to disconnected harness connector, using adapter cables from VW 1594 test kit.
- LED must light up
If LED lights up (voltage supply OK):
- Replace AIR pump motor V101.
If LED does not light up:
- Check fuse -3- on secondary air injection pump relay.
- Connect VAG 1598 test box to ECM wiring harness.
- Check wiring for open circuit between test box socket 50 and central electrics, according to wiring diagram.
- Wire resistance: Max. 1.5 Ohms
- Check AIR pump relay J299.
- Check wiring to AIR pump motor V101 according to wiring diagram.
If AIR solenoid valve does not switch:
- Disconnect 2-pin connector from AIR solenoid valve N112.
- Connect diode test lamp VAG 1527 to disconnected harness connector, using adapter cables from VW 1594 test kit.
- LED must light up
If LED lights up (voltage supply OK):
- Replace AIR solenoid valve N112.
If LED does not light up:
- Check wiring to AIR solenoid valve N112 according to wiring diagram.
- Check AIR pump relay J299.
- Press -> button.
- Press buttons -0- and -6- to select "End Output" function 06.
- Press -Q- button to confirm input.
NOTE: The secondary air injection pump continues to run until 06 is entered to select the "End Output" function.
- Switch ignition off.