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ERROR_TEMP_BATT_.jpg (32,563 bytes) |
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found damaged sensor near catalytic exhaust need replace 18491 FLANGE, THERMOSENSOR INLET /18491-63010 89425 SENSOR, EXHAUST GAS TEMPERATURE /89425-19435 (SERA01 SERA02) /89425-19495 (SERA03) 17400 CONVERTER ASSY, W/CATALYST /18450-16240 (same EL44 EL54) similar compatible /18450-11130 (EL41 EL43) also damaged ring gasket - noise /90430-08252 Gasket(for catalytic converter sensor guide) |
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Wiring: engine control computer 16P-11 is EGW - Catalytic converter temperature warning light (on combination meter) up to 3.3V = ON (short Cco – E1 on diagnosis); OFF 10-14V 16P-3 CCo - output to DIAGNOSIS connector under hood; ? 4.0V-5.5V For check this sensor lamp circuit need to put ECU GR-B (gray with black) wire to GND when IG key is ON. Panel must show only this one light... |
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Measure exhaust oxygen "rich or poor mixture" /89465-10020 Sensor oxygen ZrO2 (located at front on exhaustvmanifold "89465") has only one signal wire and GND body wrench 22 mm (or special tool) used test also with replacement , wiring is damaged here: test wiring test voltage on sensor to be on running engine 0.1V-0.9V , in case stopped engine "ON" ingnition switch must be =0.5V , but has 0 V (!) problem, may be burned track in ECU but the main issue related "catalitic converter overheating lamp" should not affected by this oxy sensor electric chain |
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Switch_Relay_Computer.png (39,219 bytes) |
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After replacememnt 2019 of rear sensor (exhaust temperature sensor after catalityc conerter) error indication is still on , 2024: pay special attention to alternator terminal "S"=sense wiring integrity, bad contact or cut suspected this white wire comes from main fuse-relay box, it has 7.5A fuse to battery |
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Found additional wire soldered to alternator Y-B terminal and goes to alarm. Temp remove it. Alternator Y-B is a negative signal to combination meter charge warning light - (connector B10) it is a problem here... measured level near 0.5V on running something like +12V expected here . it has +12V from ignition switch IG2 by B-R line (always powered when ON key position) from AM2 fused line and should not get GND from alternator "L"=light terminal Y-B line (protected reverse by diode). These lamps are linked by diode (check), so that alternator may cause this issue... but catalitic converter signal cannot light both, until diode works properly... check diode in meter -> problem is alternator wiring or inside IC
EXY10_alternator_charge_lamp_.jpg (43,832 bytes) |
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Alternator IC suspected in wrong "L" signal
Alternator_wiring_EXY10_diagram.jpg (99,783 bytes) |
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Round connector pins in 1990 model EXY10_alternator and starter wiring.jpg (779,765 bytes) |
- Anonymous