1993 VOLKSWAGEN CORRADO sensor

I - SYSTEM/COMPONENT TESTS
Article Text (p. 4)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:11PM
If wiring harness is okay, replace fuel injector(s).Fig. 2: Accessing Fuel Injectors (Corrado SLC)
Courtesy of Volkswagen United States, Inc.
6) With wiring harness and fuel injectors okay, disconnect
ignition coil power output stage. Using test leads from adapter kit,
check voltage supply to each injector by connecting LED tester between
wiring harness connector terminals. See Fig. 3.
7) Crank engine and observe LED tester. LED tester must
flicker. If LED tester does not flicker, reconnect wiring harness
connector(s) to fuel injector(s). Check wiring harness for an open
circuit between fuel injector(s) and Engine Control Module (ECM).
8) If LED tester flickers, remove fuel rail assembly (leaving
fuel lines and injectors attached). Use test leads and fuel rail hose
extensions if necessary. Disconnect Blue Engine Coolant Temperature
(ECT) sensor. Connect the 15,000 ohm side of Adapter (VAG 1490)
directly to ECT sensor wiring harness connector.
9) Place injectors in Fuel Analyzer (VAG 1602). Crank engine
and observe injectors. Injector spray pattern must be the same for all
injectors. Turn ignition on for 5 seconds and check fuel injectors for
leaks. No more than 2 drops are permissible per minute. When

I - SYSTEM/COMPONENT TESTS
Article Text (p. 5)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:11PM
reinstalling fuel rail, ensure that "O" rings are not damaged.Fig. 3: Testing Fuel Injectors & Circuit (Corrado SLC)
Courtesy of Volkswagen United States, Inc.
OXYGEN SENSOR CONTROL
IDLE CONTROL SYSTEM
IDLE AIR CONTROL (IAC) VALVE
Corrado SLC (2.8L)
1) Connect Scan Tester (VAG 1551) to Data Link Connectors
(DLC) located in center console, in front of shift lever. With scan
tester in OUTPUT DIAGNOSTIC TEST MODE, test IAC valve. For more
information, see the G - TESTS W/CODES article in this section.
2) To check IAC valve triggering circuit, turn ignition off.
Disconnect wiring harness connector from idle air control valve.
Connect LED Tester (US 1115) to wiring harness connector terminals No.
1 and 2.
3) Turn ignition on. Perform OUTPUT DIAGNOSTIC TEST MODE
until IAC valve is triggered. LED tester must flash. If LED tester
does not flash, check IAC valve circuit.
4) If LED tester flashes, disconnect wiring harness connector
from idle air control valve. Using Test Leads from Adapter Kit (VW
1594), connect DVOM to IAC valve terminals No. 1 and 2. IAC valve
resistance must be 10-20 ohms. If resistance is incorrect, replace IAC
valve.
IGNITION SYSTEM
NOTE: Ignition system testing information is not available
from manufacturer. These vehicles are equipped with a
distributorless ignition system.

J - PIN VOLTAGE CHARTS
Article Text
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:14PM
ARTICLE BEGINNING
1993 ENGINE PERFORMANCE
Volkswagen Pin Voltage Charts
Corrado SLC
INTRODUCTION
Pin voltage charts are supplied to reduce diagnostic time.
Checking pin voltages at ECU/ECM determines whether ECU/ECM is
receiving and transmitting proper voltage signals. Charts may also
help determine if ECU/ECM harness has an electrical short or open.
NOTE: Unless stated otherwise in testing procedures, perform all
voltage tests using a Digital Volt-Ohmmeter (DVOM) with a
minimum 10-megohm input impedance. Voltage readings may vary
slightly due to battery condition or charging rate.
ECU PIN VOLTAGES (CORRADO SLC)
ECU PIN VOLTAGES (CORRADO SLC - MOTRONIC)ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄComponent/Circuit (1) Test Conditions & Specified Value
(VAG 1598 Terminal No.) Additional Steps Or Test Result
ECU NOT CONNECTED TO VAG 1598/18
Voltage Supply -
Control Module (1 & 54) ... Ignition Off ..... Battery Voltage
Voltage Supply -
Control Module
Relay (1 & 23) ........ (2) Ignition Off ... Battery Voltage
Wiring To Fuel Pump
(6 & 55 - Jumper) ......... Ignition On ....... Fuel Pump Must
Operate
Heated Oxygen (O2)
Sensor Relay (7 & 28 -
Briefly Jumper) ....... (2) Ignition On ......... Relay Must
Operate (Click)
Malfunction Indicator
Light (5 & 10 - Jumper) ... Ignition On .. MIL Must Illuminate
Wiring For A/C (39 & 55) .... Ignition On,
A/C Switch On .... Battery Voltage
Wiring To A/C Compressor
(37 & 38 - Jumper) ........ Ignition On ......... A/C Magnetic
Clutch Operates
Fuel Injector No. 1
(23 & 24) ................. Ignition Off ........ 15-21.5 Ohms
Fuel Injector No. 2
(3 & 23) .................. Ignition Off ........ 15-21.5 Ohms
Fuel Injector No. 3

J - PIN VOLTAGE CHARTS
Article Text (p. 2)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:14PM
(23 & 26) ................. Ignition Off ........ 15-21.5 Ohms
Fuel Injector No. 4
(4 & 24) .................. Ignition Off ........ 15-21.5 Ohms
Fuel Injector No. 5
(23 & 25) ................. Ignition Off ........ 15-21.5 Ohms
Fuel Injector No. 6
(2 & 23) .................. Ignition Off ........ 15-21.5 Ohms
EVAP Solenoid Valve I
(23 & 31) ................. Ignition Off .......... 40-80 Ohms
Coolant Temp.
Sensor (14 & 33) ........ (3) Ignition Off ............... (3)
Wiring To White DLC
(4) (1 & 21) .............. Ignition Off .... 1.5 Ohms Maximum
Wiring To White DLC
(4) (2 & 43) .............. Ignition Off .... 1.5 Ohms Maximum
Wiring To Oxygen (O2)
Sensor (20 & 42) ....... Disconnect Sensor
Connector & Jumper
Terminals No. 3 & 4 ... 1.5 Ohms Max.
Reconnect Sensor
Connector ......... Infinity (Open)
Throttle Potentiometer
(33 & 41) ................. Ignition Off ........... 1750 Ohms
Throttle Potentiometer
(33 & 40) ............. Throttle Valve Closed ...... 1150 Ohms
Throttle Potentiometer
(33 & 40) ............. Throttle Valve Opened ..... Resistance
Must Increase
Throttle Potentiometer
(40 & 41) ............. Throttle Valve Closed ...... 2700 Ohms
Throttle Potentiometer
(40 & 41) ............. Throttle Valve Opened ..... Resistance
Must Decrease
Wiring To Hall Effect
Sensor (7 & 44) ........ Disconnect Sensor
Connector & Jumper
Terminals No. 1 & 2 ... 1.5 Ohms Max.
Wiring To Hall Effect
Sensor (7 & 23) ........ Disconnect Sensor
Connector & Jumper
Terminals No. 1 & 3 ... 1.5 Ohms Max.
Wiring To Ignition
Coil Power Output
Stage (8 & 55) ....... Disconnect Output
Stage Connector & Jumper
Terminals No. 1 & 2 ... 1.5 Ohms Max.
Wiring To Ignition
Coil Power Output
Stage (8 & 38) ....... Disconnect Output
Stage Connector & Jumper
Terminals No. 2 & 3 ... 1.5 Ohms Max.
Wiring To Knock Sensor I

J - PIN VOLTAGE CHARTS
Article Text (p. 3)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:14PM
(33 & 34) (5) .......... Disconnect Sensor
Connector ....... Infinity (Open)
Wiring To Knock Sensor I
(33 & 34) (5) .......... Disconnect Sensor
Connector ....... Infinity (Open)
Wiring To Knock Sensor I
(7 & 34) (5) ........... Jumper Terminals
No. 1 & 2 ......... 1.5 Ohms Max.
Intake Air Temperature
Sensor (33 & 36) ....... Jumper Terminals
No. 1 & 2 ......... 1.5 Ohms Max.
Intake Air Control
Valve (27 & 53) ........ Jumper Terminals
No. 1 & 2 ......... 1.5 Ohms Max.
Wiring To Knock Sensor II
(7 & 33) (6) ........... Disconnect Sensor
Connector ....... Infinity (Open)
Wiring To Knock Sensor II
(7 & 33) (6) ........... Disconnect Sensor
Connector ....... Infinity (Open)
Wiring To Knock Sensor II
(56 & 57) (6) .......... Jumper Terminals
No. 1 & 2 ......... 1.5 Ohms Max.
Wiring To MAF Sensor
(1 & 16) ............... Disconnect Sensor
Connector & Jumper
Terminals No. 1 & 2 ... 1.5 Ohms Max.
Wiring To MAF Sensor
(1 & 17) ............... Disconnect Sensor
Connector & Jumper
Terminals No. 1 & 3 ... 1.5 Ohms Max.
Wiring To MAF Sensor
(56 & 59) .............. Disconnect Sensor
Connector & Jumper
Terminals No. 1 & 4 ... 1.5 Ohms Max.
Wiring To MAF Sensor
(1 & 23) ............... Disconnect Sensor
Connector & Jumper
Terminals No. 1 & 5 ... 1.5 Ohms Max.
Engine Speed Sensor
(67 & 68) (7) ............ Ignition Off ......... 500-700 Ohms
Engine Speed Sensor
(56 & 67) (7) ............ Ignition Off ......... 500-700 Ohms
Engine Speed Sensor
(56 & 68) (7) ............ Ignition Off ......... 500-700 Ohms
EGR Frequency Valve
(9 & 56 - Jumper) ...... Jumper Terminals No.
30 & 55 of Test Box ...... Valve Must
Briefly Click
Wiring To EGR Frequency
Valve (23 & 30) ........ Disconnect Valve

J - PIN VOLTAGE CHARTS
Article Text (p. 4)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:14PM
Connector & Jumper
Terminals No 1 & 2. ... 1.5 Ohms Max.
EGR Temperature
Sensor (15 & 33) ....... Disconnect Sensor
Connector & Jumper
Terminals No 1 & 2. ... 1.5 Ohms Max.
(1) - TESTING CONDITIONS: Disconnect harness connector from ECM.
Connect Test Box (VAG 1598/18) to ECM harness connector, leaving
the ECM disconnected.
(2) - With ignition off, jumper terminals No. 9 and No. 55 of the
test box.
(3) - Refer to the I - SYS/COMP TESTS article.
(4) - These are terminal connectors at data link connector.
(5) - 3-pin connector is located at rear of engine mount.
(6) - 3-pin Black connector is located next to starter.
(7) - 3-pin White connector is located next to starter.ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄEND OF ARTICLE

MAINTENANCE INFORMATION
Article Text (p. 14)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:14PM
Right Low Beam
3 - 10 Amp (Red)
Instrument Lights, License Plate Lights
4 - 15 Amp (Blue)
Rear Window Wiper, Sliding Roof
5 - 15 Amp (Blue)
Windshield & Rear Window Washer, Windshield Wiper
6 - 20 Amp (Yellow)
Air Conditioner, Fresh Air Fan
7 - 10 Amp (Red)
Right Tail & Side Lights
8 - 10 Amp (Red)
Left Tail & Side Lights
9 - 20 Amp (Yellow)
Rear Window Defroster, Mirror Heating
10 - 15 Amp (Blue)
Foglights
11 - 10 Amp (Red)
Left High Beam, High Beam Indicator
12 - 10 Amp (Red)
Right High Beam
13 - 10 Amp (Red)
Horn, Radiator Fan
14 - 15 Amp (Blue)
Back-Up Lights, Electric Mirrors, Heated Washer Jets
15 - 10 Amp (Red)
Electronic Ignition, Idle Stabilizer,
Deceleration Fuel Shut Off
16 - 15 Amp (Blue)
Warning/Indicator Lights, Multi-Function Indicator, Glove Box
Light, Cassette Storage Light, Rear Spoiler Control Unit
17 - 10 Amp (Red)
Emergency Flashers, Turn Signals
18 - 20 Amp (Yellow)
Fuel Pump, Heated Oxygen Sensor
19 - 30 Amp (Green)
Radiator Fan, Air Conditioner
20 - 10 Amp (Red)
Brake Lights, Cruise Control
21 - 15 Amp (Blue)
Interior Compartment Lights, Cigarette Lighter, Digital Clock
Central Locking System, Rear Spoiler Adjustment
22 - 10 Amp (Red)
Radio
Relay & Circuit Breaker Identification
1 - A/C Control Module Relay
2 - Rear Window Wiper/Washer Relay
3 - ECM Power Supply Relay
4 - Load Reduction Relay
5 - Low Coolant Level

MAINTENANCE INFORMATION
Article Text (p. 16)
1993 Volkswagen Corrado
For Volkswagen Technical Site: http://vw.belcom.ru
Copyright © 1998 Mitchell Repair Information Company, LLC
Wednesday, March 22, 2000 09:14PM
WARNING: Always disconnect battery ground cable before servicing
"high-current fuses. It is recommended that "high-current"
fuses be replaced by a qualified technician.
Fuse & Circuit Breaker Identification
1 - 10 Amp (Red)
Left Low Beam
2 - 10 Amp (Red)
Right Low Beam
3 - 10 Amp (Red)
Instrument Lights, License Plate Lights
4 - 15 Amp (Blue)
Rear Window Wiper, Sliding Roof
5 - 15 Amp (Blue)
Windshield & Rear Window Washer, Windshield Wiper
6 - 20 Amp (Yellow)
Air Conditioner, Fresh Air Fan
7 - 10 Amp (Red)
Right Tail & Side Lights
8 - 10 Amp (Red)
Left Tail & Side Lights
9 - 20 Amp (Yellow)
Rear Window Defroster, Mirror Heating
10 - 15 Amp (Blue)
Foglights
11 - 10 Amp (Red)
Left High Beam, High Beam Indicator
12 - 10 Amp (Red)
Right High Beam
13 - 10 Amp (Red)
Horn, Radiator Fan
14 - 15 Amp (Blue)
Back-Up Lights, Electric Mirrors, Heated Washer Jets
15 - 10 Amp (Red)
Electronic Ignition, Idle Stabilizer,
Deceleration Fuel Shut Off
16 - 15 Amp (Blue)
Warning/Indicator Lights, Multi-Function Indicator, Glove Box
Light, Cassette Storage Light, Rear Spoiler Control Unit
17 - 10 Amp (Red)
Emergency Flashers, Turn Signals
18 - 20 Amp (Yellow)
Fuel Pump, Heated Oxygen Sensor
19 - 30 Amp (Green)
Radiator Fan, Air Conditioner
20 - 10 Amp (Red)
Brake Lights, Cruise Control
21 - 15 Amp (Blue)
Dome & Luggage Compartment Lights, Cigarette Lighter, Clock
Central Locking System, Multi-Function Indicator,
Rear Spoiler Adjustment, Engine Diagnostic