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Fig. 18: Identifying VREF Circuit & Connector
VREF CIRCUIT PIN IDENTIFICATION 1. On 1.3L, go to next step. On 1.6L, turn ignition on. Measure voltage between throttle position switch VREF and SIGRTN wires. See VREF CIRCUIT PIN IDENTIFICATION table. If voltage is 10-12 volts, repair short to voltage. If voltage is zero volts, go to next step. 2. Turn ignition on. On 1.3L, measure voltage between Black and White-Black wires at VAF sensor. On 1.6L, measure voltage between White-Black and Blue/Yellow wires at BP sensor. If voltage is 4-5 volts, VREF circuit is okay. If voltage is zero volts, go to next step. If 3. Turn ignition off. Install BOB. Install 4EAT tester (if vehicle is equipped with 4EAT transaxle). Unplug connector from VAF, TP, and BP sensors as applicable to vehicle. Measure resistance between VREF terminals on ECA and 4EAT module. Also measure resistance 4. Turn ignition off. Disconnect 4EAT module (if equipped). Unplug connector from VAF, TP, and BP sensors as applicable to vehicle. Measure resistance between ECA VREF pin on BOB and ground. If resistance is not greater than 10,000 ohms, repair short in VREF 5. Turn ignition off. Disconnect ECA. Unplug connector from VAF, TP, and BP sensors as applicable to vehicle. Measure resistance between ECA SIGRTN, 4EAT, and all SIGRTN pins on BOB. If any measurement is greater than 5 ohms, repair wire in question. If 6. Turn ignition off. Install BOB. Connect ECA. Connect 4EAT module (if equipped). Turn ignition on. Measure voltage at ECA SIGRTN test pin on BOB. If voltage is 0-1 volt, go to PINPOINT TEST PGC . If voltage is not 0-1 volt, repair short to voltage on SIGRTN circuit. SUMMARY Circuit ECA Pin BOB Pin Wire Color 1.3L SIGRTN 2D 46, 49 BLK VREF 2K 26 WHT/BLK 1.6L SIGRTN 2C 46 BLU/YEL VREF 2A 26 WHT/BLK |