System Check

Turn ignition switch off. Unplug control unit connector. Using an ohmmeter and voltmeter, check system components and circuits. See Vanagon AFC System Ohmmeter and Voltmeter Checks charts.

VANAGON AFC SYSTEM OHMMETER CHECKS

Ohmmeter To Terminal	Components Checked	Specifications
No. 1 & Ground	Wire to No. 1 terminal on coil	Infinity with White coil wire disconnected and 0 when wire is grounded
No. 3 & No. 18	Full throttle enrichment circuit	0 ohms with accelerator pedal fully down
No. 5 & Ground	Ground circuit	0 ohms
No. 6 & No. 9	Air sensor circuit	200-400 ohms
No. 6 & No. 8	Air sensor circuit	130-260 ohms
No. 8 & No. 9	Air sensor circuit	70-140 ohms
No. 6 & No. 7	Air sensor circuit	40-300 ohms
No. 7 & No. 8	Air sensor circuit	100-500 ohms
No. 6. & No. 27	Air sensor circuit	Maximum of 2800 ohms at 68°F (20°C)
No. 13 & Ground	Head sensor	2100-2900 ohms at 68°F (20°C) and 270-390 ohms at 176°F (81°C)
No. 14 & No. 10	Injector wire and resistor	Approximately 7 ohms
No. 15 & No. 10	Injector wire and resistor	Approximately 7 ohms
No. 32 & No. 10	Injector wire and resistor	Approximately 7 ohms
No. 33 & No. 10	Injector wire and resistor	Approximately 7 ohms
No. 16 & Ground	Ground circuit	0 ohms
No. 17 & Ground	Ground circuit	0 ohms
No. 34 at control and No. 37 at double relay on firewall	Auxiliary air regulator circuit	Approximately 30 ohms

VANAGON AFC SYSTEM OHMMETER CHECKS

Ohmmeter To Terminal	Components Checked	Specifications
No. 4 & Ground	Starter signal	O volts normally, 12 volts during cranking
No. 10 & Ground	Voltage supply to computer	12 volts with key on, 0 volts with key off
No. 20 & Ground	Pump circuit	12 volts with key on and sensor flap open