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Home >> Volkswagen >> 1996 >> Passat GLX, 4D Sedan, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.8L >> Self-Diagnostic System >> Read Measurement & Read Measuring (Test) Value Block
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Read Measurement & Read Measuring (Test) Value Block

NOTE: See ENTERING SELF-DIAGNOSTICS  for additional scan tool operating instructions.
  1. Ensure battery voltage and fuse No. 18 are okay. Ensure engine ground connections at cylinder head cover and manifold are okay.
  2. Data Link Connector (DLC) is located below tachometer. See Figure or Figure . Remove ashtray and slide DLC cover to left. Ensure ignition is off. Connect scan tool to DLC. Scan tool should alternately display 1-RAPID DATA TRANSFER and 2-BLINK CODE OUTPUT.
  3. Turn ignition on, or start engine, depending on function being selected. See SELECTABLE FUNCTIONS  table under ENTERING SELF-DIAGNOSTICS. Press "1" button to select RAPID DATA TRANSFER function.
  4. Press "0" and "8" buttons to select READ MEASURING VALUE BLOCK MODE function. Press "Q" button to enter input. OUTPUT DIAGNOSTIC TEST MODE will be displayed on scan tool.
  5. Press "3" button to select next higher group, "1" button to select next lower group or "C" button to skip a group. See DISPLAY GROUP  table. When display group "000" is selected, only READ MEASUREMENT BLOCK is shown on display (the zeros do not appear on display). Scan tool displays a value (specification) which corresponds to operating parameters used by ECM. When READ MEASUREMENT BLOCK function is completed, select END DATA TRANSFER function on scan tool. Turn ignition off. Disconnect scan tool.
DISPLAY GROUP

Display Group No. & Channel No. System/Affected Circuit (1) Repair/Parameters (Value Displayed)
000
1 Engine Coolant Temperature (2) 80-180°C (170-204)
2 Engine Load (3) 1.4-2.4 ms (28-58)
3 Engine Speed (4)(5)
4 Battery Voltage (6) 12.0-14.0 Volts (176-212)
5 Throttle Valve Angle (7) 0-10° (0-23)
6 Idle Control (8) -5 To 5 kg/h (112-144)
7 Mass Airflow (8) -5 To 5 kg/h (112-144)
8 Oxygen Sensor Control (9) -5 To 5% (96-160)
9 Pre-Catalyst O2 Sensor Idle Adaptation Value (10) -10 To 10% (241-255 Or 0-14)
10 Pre-Catalyst O2 Sensor Load Adaptation Value (10) -7 To 7% (118-138)
(1) If connectors, wiring circuits and components are okay, substitute a known-good ECM and retest system.
(2) If reading is less than specification, check thermostat operation. If thermostat is okay, check Engine Coolant Temperature (ECT) sensor, connectors and wiring circuit. If reading is more than specification, check ECT sensor, connectors and wiring circuit.
(3) If reading is less than specification, check intake air system for leaks. If no leaks exist, check fuel pressure regulator. If reading is more than specification, turn off all accessories, and check pre-catalyst Heated Oxygen Sensor (HO2S) heater operation. If HO2S heater is okay, check H02S, connectors and wiring circuit.
(4) 800-880 RPM (80-88).
(5) If reading is less than specification, place gear selector in "P" or "N" position. Check Throttle Valve Control Module (TVCM) connectors and wiring circuit. If connectors and wiring circuit are okay, substitute a known-good TVCM and retest system. If reading is more than specification, check fuel pressure regulator. If fuel pressure regulator is okay, substitute a known-good TVCM and retest system.
(6) If reading is less than specification, check battery, generator and ECM voltage supply circuit. If reading is more than specification, check voltage regulator.
(7) If reading is more than specification, check throttle cable adjustment. If cable is adjusted properly, substitute a known-good throttle valve control module
(8) If reading is less than specification, check intake air system for leaks. If reading is more than specification, turn off all accessories.
(9) If reading is less than specification, check pre-catalyst Heated Oxygen Sensor (HO2S) heater operation. If HO2S heater is okay, check HO2S, connectors and wiring circuit. If HO2S, connectors and wiring circuit are okay, check fuel pressure regulator. If reading is more than specification, check pre-catalyst Heated Oxygen Sensor (HO2S) heater operation. If HO2S heater is okay, check HO2S, connectors and wiring circuit. If HO2S, connectors and wiring circuit are okay, check intake air system for leaks. If no leaks exist, check fuel injectors. If reading is 128, check amount of fuel in tank. Check for secondary air injection system malfunctions. Check pre-catalyst Heated Oxygen Sensor (HO2S) heater operation. If HO2S heater is okay, check HO2S, connectors and wiring circuit.
(10) If reading is -5% to -16.4%, change engine oil, check fuel pressure regulator, fuel injectors for leaks and Heated Oxygen Sensor (HO2S) heater. If reading is 5% to 16.4%, check intake air system for leaks, exhaust system, fuel pressure regulator, HO2S heater and fuel injectors. If reading is constant at zero, check wiring circuit between HO2S connector and ECM. See appropriate pin voltage chart in PIN VOLTAGE CHART S article. If wiring circuit is okay, check mass airflow sensor.
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