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Home >> Volkswagen >> 2001 >> Jetta GL, 2.0 B >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 (On Board Diagnostic (OBD) - 2.8L VR6, AAA) >> Electrical testing with (VAG1598 test box) >> Electrical test table >> Notes

Electrical test table: Notes

WARNING: This page is about a different car, the 1995 Volkswagen Jetta III, 1995 Volkswagen GTI, and 1994 Volkswagen Jetta III. However, it is still accessible from the selected car via links, so may be relevant.
ELECTRICAL TEST (STEPS 1 TO 5)

  • Measuring range: Switch to voltage measurement -V-.
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
1 Voltage supply for Motronic ECM (J220) Diagnostic Trouble Code (DTC) memory
  • Ignition switched OFF
 1 + 54 Approx. Battery Positive Voltage (B+)
2 Voltage supply for Motronic ECM (J220) DTC memory (via Motronic ECM Power Supply Relay (J27(1))
  • Ignition switched OFF
  • Bridge sockets 9 + 55 on Test Box
 1 + 23 Approx. Battery Positive Voltage (B+)
3 Wiring to Fuel Pump (FP) relay (J17)
  • Switch ignition ON
 Bridge 6 + 55 Fuel pump must be heard to run (audible)
4 Voltage Supply for Mass Air Flow (MAF) sensor (G70) (4 -pin connector)
  • Ignition switched ON
  • Pull connector off MAF Sensor (G70)
  • Connect multimeter across terminals 1 + 3(2)
 Bridge 6 + 55 Approx. Battery Positive Voltage (B+)
5 Voltage Supply for Mass Air Flow (MAF) sensor (G70) (6 -pin connector)
  • Ignition switched OFF
  • Disconnect connector from MAF Sensor (G70)
  • Connect multimeter across terminals 1 + 5(3)
  • Bridge 9+55
 Approx. Battery Positive Voltage (B+)
(1) Observe notes See ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Connector pin assignment, see Figure
(3) Connector pin assignments, see Figure
ELECTRICAL TEST (STEPS 6 AND 7)

  • Measuring range: Voltage measurement -V- selected.
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
6 Heated Oxygen Sensor (HO2S) Relay (J278)
  • Ignition switched ON
  • Disconnect Oxygen Sensor connector
  • Connect multimeter across connector terminals 1 + 2(2)
  • Bridge test box sockets 1 + 6
  • Bridge test box sockets 9 + 55
 Bridge 1+28 Approx. Battery Positive Voltage (B+)
7 Malfunction Indicator Lamp (MIL) lamp (K83)
  • Ignition switched ON
 Bridge 5+10 Lamp must light up
(1) Observe notes See ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Connector pin assignment, see Figure
ELECTRICAL TEST (STEPS 8 TO 11)

  • Measuring range: Voltage measurement -V- selected
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
8 Ground (GND) wire for Motronic ECM (2) ----- 7 + 54 Approx. Battery Positive Voltage (B+)
Wiring to Park/Neutral Position (PNP) Relay (J226)(3)
  • Selector lever in "P" position
  • Disconnect (5 -pin) connector from ignition coil
  • Operate starter
 1 + 7 Approx. 2 Volts less than battery Voltage (B+)
9 Speedometer Vehicle Speed Sensor (VSS) (G22)
  • Ignition switched ON
  • Lift front left wheel and turn
 56 + 65 0 - 10 Volts (fluctuating)
10(4) Wiring from air conditioning
  • Ignition switched ON
  • Switch air conditioner ON
 39 + 55 Approx. Battery Positive Voltage (B+)
11(4) Wiring to A/C compressor
  • Ignition switched ON
 Briefly bridge 37+38 Air conditioner compressor clutch must be heard to engage
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Only for vehicles with manual transmission
(3) Only for vehicles with automatic transmission
(4) Only for vehicles with A/C
ELECTRICAL TEST (STEPS 12 TO 19)

  • Switch ignition OFF.
  • Measuring range: Switch to resistance measurement -Ω-.
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
12 Fuel Injector, cyl. 1 (N30) and wiring ----- 23 + 24 15 - 21.5 Ω
13 Fuel Injector, cyl. 2 (N31) and wiring ----- 3 + 23 15 - 21.5 Ω
14 Fuel Injector, cyl. 3 (N32) and wiring ----- 23 + 26 15 - 21.5 Ω
15 Fuel Injector, cyl. 4 (N33) and wiring ----- 4 + 23 15 - 21.5 Ω
16 Fuel Injector, cyl. 5 (N83) and wiring ----- 23 + 25 15 - 21.5 Ω
17 Fuel Injector, cyl. 6 (N84) and wiring ----- 2 + 23 15 - 21.5 Ω
18 Evaporative Emissions (EVAP) canister purge regulator valve (N80) and wiring ----- 23 + 31 40 - 80 Ω
19(2) Engine Coolant Temperature (ECT) Sensor (G62) and wiring ----- 14 + 33 Resistance, see Figure
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) If the On Board Diagnostic indicates a sensor malfunction which is not established by this test, it could be caused by a temporary break in the temperature signal. In this case, additionally check the Engine Coolant Temperature sensor. See ENGINE COOLANT TEMPERATURE (ECT) SENSOR, CHEC .
ELECTRICAL TEST (STEPS 20-22)

  • Ignition switched OFF
  • Measuring range: Resistance measurement -Ω- selected
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
20 Wiring to Data Link Connector (DLC) ----- 43 + DLC terminal 7(2) on 16-pin Data Link Connector (DLC) socket Max. 1.5 Ω
21 Wiring to Heated Oxygen Sensor (HO2S (G39)
  • Disconnect harness connector from HO2S
  • Bridge connector terminals 3 + 4(3)
 20 + 42 max. 1.5 Ω
  • Reconnect connector
 INFINITE Ωno continuity)
22 Throttle Position (TP) sensor (G69) and wiring ----- 33 + 41 1.50 - 2.50 kΩ
  • Throttle valve closed
 33 + 40 0.70 - 1.30 k Ω
  • Open throttle valve
 33 + 40 Resistance must increase
  • Throttle closed valve
 40 + 41 2.50 - 3.50 k Ω
  • Open throttle valve
 40 + 41 Resistance must decrease
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Connector pin assignment, see Figure
(3) Connector pin assignment, see Figure
ELECTRICAL TEST (STEPS 23 TO 24)

  • Ignition switched OFF
  • Measuring range: Resistance measurement -Ω- selected
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
23 Wiring to Camshaft Position (CMP) sensor (G40)
  • Disconnect connector from CMP sensor -G40
  • Bridge connector terminals 1 + 3(2)
 23 + 56 max. 1.5 Ω
  • Bridge connector terminals 2 + 3(2)
 44 + 56
24 Wiring to ignition coil (N152)
  • Disconnect connector from Ignition Coil (N152)
  • Bridge connector terminals 1 + 2(3)
 8 + 55 max. 1.5 Ω
  • Bridge connector terminals 1 + 3(3)
 55 + 60 max. 1.5 Ω
  • Bridge connector terminals 1 + 4(3)
 52 + 55 max. 1.5 Ω
  • Bridge connector terminals 1 + 5(3)
 38 + 55 max. 1.5 Ω
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Connector pin assignment, see Figure
(3) Connector pin assignment, see Figure.
ELECTRICAL TEST (STEPS 25 TO 27)

  • Ignition switched OFF
  • Measuring range: Resistance measurement -Ω- selected
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
25 Wiring to Knock Sensor (KS) 1 (G61)
3-pin connector (white) on rear engine mounting
  • Disconnect connector from knock sensor
 33 + 34 INFINITE Ω (no continuity)
  • Bridge connector terminals 1 + 2(2)
 max. 1.5 Ω
  • Bridge connector terminals 1 + 32)
 34 + 56 max. 1.5 Ω
26 Intake Air Temperature (IAT) sensor (G72) and wiring ---- 33 + 36 Figure
27 Idle Air Control (IAC) Valve (N71) and wiring ---- 27 + 53 6 - 12 ohms
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Connector pin assignment, see Figure
ELECTRICAL TEST (STEPS 28 TO 30)

  • Ignition switched OFF
  • Measuring range: Resistance measurement -Ω- selected
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
28 Wiring to Knock Sensor (KS) 2 (G66)
3-pin connector (black) near starter
  • Disconnect connector from knock sensor
 33 + 56 INFINITE Ω (no continuity)
  • Bridge connector terminals 2 + 3(2)
 max. 1.5 Ω
  • Bridge connector terminals 1 + 3(2)
 56 + 57
29 Wiring to Mass Air Flow (MAF) sensor (G70) (4-pin connector)
  • Disconnect connector from MAF sensor (G70)
  • Bridge connector terminals 2 + 4(3)
 16 + 17 max. 1.5 Ω
30 Wiring to Mass Air Flow (MAF) sensor (G70) (6-pin connector)
  • Disconnect connector from MAF sensor (G70)
  • Bridge connector terminals 1 + 2(4)
 1 + 16 max. 1.5 Ω
  • Bridge connector terminals 1 + 3(4)
 1 + 17
  • Bridge terminals 1 + 4(4)
 56 + 59
  • Bridge terminals 1 + 5(4)
 1 + 23
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Connector pin assignment, see Figure
(3) Connector pin assignment, see Figure
(4) Connector pin assignments, see Figure
ELECTRICAL TEST (STEPS 31 TO 35)

  • Ignition switched OFF
  • Measuring range: Resistance measurement -Ω- selected
Test step  Item checked 
  • Test conditions
  • additional steps
 Test Box sockets  Specifications  (1) 
31 Engine Speed (RPM) sensor (G28) and wiring
3-pin connector (white) near starter		 ---- 67 + 68 500 - 700 Ω
56 + 67 56+68 INFINITE Ω (no continuity)
32(2) EGR Vacuum Regulator Solenoid Valve (N18) (two-way valve)
  • Bridge test box sockets 30 + 55
 Briefly bridge 9+56 Valve must be heard to click
33(2) Wiring to EGR Vacuum Regulator Solenoid Valve (N18) (two-way valve)
  • Disconnect connector from Valve (N18)
  • Bridge connector terminals 1 + 2
 23 + 30 max. 1.5 Ω
34(2) EGR Temperature sensor (G98)2) and wiring ---- 15 + 33 Resistance, see, Figure
35(3) Secondary Air Injection (AIR) pump relay (J299)
  • Bridge test box sockets 9 + 55 of Test Box
 Briefly bridge 1+49 Relay must be heard to click
Secondary Air Injection (AIR) pump motor (V101)
  • Test box sockets 9 + 55
 Motor must run
Secondary Air Injection (AIR) solenoid valve (N112) (change-over valve)
  • Test box sockets 9 + 55 bridged
  • Disconnect connector from Air pump motor (V101)
 Briefly bridge 1+50 Solenoid Valve (N112) (change-over valve) must be felt to switch
(1) Observe notes in ELECTRICAL TESTING WITH (VAG1598 TEST BOX) 
(2) Only for vehicles with Exhaust Gas Recirculation (EGR) system
(3) Only for vehicles with Secondary Air Injection (AIR) system
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