engine check light

[okazakifett]

hi all, my 1993 surf check engine light comes on when motor running at normal temp, not while warming up, had the computer read and was told no fault found ,,,can anybody help out with this

[tweake]

check water in the fuel sensor. assuming diesel.

otherwise you need to let us know what engine you have and also exactly which light came on and what was happening at the time it came on.

[okazakifett]

hi thanks for your reply ,,, its a 3ltr petrol , when the check engine light comes on its at operating temp also nothing seems out of place oil pressure is fine temp is normal , the light is the check engine light far left on the cluster , orange colour , hope thats helps mate thanks

[tweake]

i don't know the petrols sorry.

all i can suggest is jump onto the surf forums and find the method to get the codes manually. that way you can do it yourself in case it was a code reader issue.
possible someone has written down if there is any other non-ecu item that can trip the engine light.

[okazakifett]

Thanks mate.i did take it for a scan but nothing showed up.so must be a electrical fault in a senser im hoping anyways!

[tweake]

Thanks mate.i did take it for a scan but nothing showed up.so must be a electrical fault in a senser im hoping anyways!

if it was a sensor fault it would store a code.

it could easily be that the code reader doesn't work with such old systems.
hence i would go pull the codes the old fashion way. should be a procedure on one of the sites, also check out the 4runner sites.
its not hard to do and will save you some $$$.

[okazakifett]

my mechanic did a scan for a favor but he stated that no mechanical fault was found , however i was under the impression the 93 ECU is not compatible with newer scanners? i have codes available to me so i may just try it myself..... thanks guys

[okazakifett]

if any one needs i found this
Trouble Codes


92-95 4Runner 3.0L Engine Code: 3VZ-E
92-95 Pickup 3.0L Engine Code: 3VZ-E
93-94 T100 Pickup 3.0L Engine Code: 3VZ-E
Trouble code Fault location Probable cause
12 Engine speed (RPM) sensor-circuit Wiring, RPM sensor, ECM
13 Engine speed (RPM) sensor -above 1000 rpm Wiring, RPM sensor, ECM
14 Ignition reference signal -no signal Wiring, ignition module, ECM
16 Transmission control signal -malfunction ECM
21 Heated oxygen sensor (H02S)-front –circuit Wiring, H02S, ECM
22 Engine coolant temperature (ECT) sensor circuit Wiring, ECT sensor, ECM
24 lntake air temperature (lAT) sensor-circuit Wiring, lAT sensor, ECM
25 Mixture control -continuously lean Wiring, injector, H02S, ECT/VAF sensor, intake/fuel/ignition system, ECM
26 Mixture control -continuously rich Wiring, injector, fuel system, cold start injector, H02S, ECT/VAF sensor, ECM
27 Heated oxygen sensor (H02S) -rear-circuit Wiring, H02S, ECM
31 Volume air flow (VAF) sensor-circuit Wiring, VAF sensor, ECM
32 Volume air flow (VAF) sensor-circuit Wiring, VAF sensor, ECM
35 Barometric pressure (BARO) sensor-circuit ECM
41 Throttle position (TP) sensor -circuit Wiring, TP sensor, ECM
42 Vehicle speed sensor (VSS) -circuit Wiring, VSS, ECM
43 Starter signal -circuit Wiring, ignition switch, engine control relay, ECM
51 Switch signal -A/C switch ON during diagnosis Wiring, A/C switch, A/C amplifier, ECM
51 Switch signal -closed throttle position (CTP) switch OFF during diagnosis Wiring, CTP switch, ECM
51 Switch signal -park/neutral position (PNP) switch not in P or N during diagnosis Wiring, PNP switch, ECM
52 Knock sensor (KS) -circuit Wiring, KS, ECM
53 Knock control -malfunction ECM
71 Exhaust gas recirculation (EGR) system malfunction Hose leak/blockage, wiring, EGRT sensor, EGR solenoid, ECM

[okazakifett]

found the fault the code is 52 52 Knock sensor (KS) -circuit Wiring, KS, ECM,,,, now is this easy to fix? and thanks all with my questions!

[tweake]

found the fault the code is 52 52 Knock sensor (KS) -circuit Wiring, KS, ECM,,,, now is this easy to fix? and thanks all with my questions!

i don't have a book on them to check with.

check the obvious, if wires been hit, corrosion on pins.
otherwise change sensor.

also on those age vehicles is ecu's. a common thing we get in the diesels of that age is the capacitors in the ecu start to fail and it can cause weird faults to come up.

[okazakifett]

thanks mate