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Old 09-28-2006, 09:20 PM   #1 (permalink)
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Couple questions about an '89 K5...

This thing isn't as easy to troublshoot than my older K5. First, the 'service engine soon' light comes on intermittently. What sensors are linked to this light?
And...
The transmission hesitates for 3-5 seconds before going into drive, is this normal? Thanks!!!
Shaun.

Edit: It's a 1989 fullsize blazer, 350TBI, 700R4.
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Old 09-29-2006, 06:45 PM   #2 (permalink)
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Anyone?
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Old 09-29-2006, 07:06 PM   #3 (permalink)
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Check the fluid level with the engine running, or you may have to change the filter and gasket. For the light, you'll have to scan the computor and get some service codes.
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Old 09-29-2006, 08:20 PM   #4 (permalink)
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Thanks!!
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Old 09-30-2006, 09:44 PM   #5 (permalink)
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The "scan tool" for your truck consists of a bent paper clip shoved into the ALDL port under the steering column. Do a google search and you will be able to find out how to do it and what the codes mean.
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Old 10-01-2006, 03:34 PM   #6 (permalink)
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I tried searching and came up with nothing. Any links? Thanks.
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Old 10-01-2006, 04:26 PM   #7 (permalink)
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I found all this in the 1st and 2nd links that came up when searching ALDL codes on google.
http://www.google.com/search?hl=en&q...=Google+Search
http://www.aldlcable.com/
http://www.s10blazers.com/service_engine_soon.htm

Turn engine/key off
Jumper the top right terminals of the ALDL port

Turn key on but engine off
Watch check engine light for blinking.
1-flash then 2-flashes = code 12 which means the self diagnostic in the computer is working.
It will then flash other codes.

Code:
Code
	
System / Circuit
	
Problem


 Code 12
	

System OK
	
If this code continues to Flash after 3 times, no codes are stored in the Computer, and everything should be fine.
 Code 13
	

Oxygen Sensor
	
Check the wiring and connections to the sensor.  Check for a sticking throttle position sensor.  Replace Sensor.
 Code 14
	
Coolant Sensor
High Temp.
	
Check the wiring and connections to the sensor.  Find cause for overheating, Replace Sensor.
 Code 15
	
Coolant Sensor
Low Temp.
	
Check the wiring and connections to the sensor.  Check ECM Connection too, Replace Sensor.
 Code 21
	
Throttle Position Sensor
High Voltage
	
Check for sticking TPS Plunger.  Check the wiring and connections to the sensor.  Replace Sensor.
 Code 22
	
Throttle Position Sensor
Low Voltage
	
Check the adjustment of the TPS Plunger.  Check the wiring and connections to the sensor.
 Code 23†
	
Mixture Control
Solenoid
	
The Mixture Control Solenoid is Open or Grounded.
 Code 23
	
MAT Low Temp
Indication
	
Sets if the Manifold Air Temperature Sensor, Connections or Wires are Open for 3 Seconds.
 Code 24
	
Vehicle Speed Sensor
	
A Fault in this Circuit should be Indicated Only When the Vehicle is in Motion.
 Code 25
	
ATI Sensor/High Air
	
High Temperature Indication.
 Code 32†
	
BARO Circuit Low
	
Barometric Pressure Sensor Circuit Low.
 Code 32
	
EGR
	
Vacuum switch shorted to ground on startup, switch not closed after the ECM has commanded the EGR for a specific period of time or the EGR solenoid circuit is open for a specific period of time.  Replace EGR Valve.
 Code 33
	
MAP Sensor
	
Check the vacuum hoses from the MAP Sensor.  Check the Electrical connections at the ECM.  Replace MAP Sensor.
 Code 34
	
Vacuum Sensor or MAP Sensor
	
Sets when the signal voltage from the MAP sensor is too low.  Instead the ECM will substitute a fixed MAP Valve and use the TPS to control fuel delivery.  Replace MAP Sensor.
 Code 35†
	
ISC Valve
	
Idle Speed Control Error.  Replace the ISC.
 Code 35
	
IAC Valve
	
Idle Air Control Error.  Will set when closed throttle speed is 50 RPM above or below the correct idle speed for 30 seconds.  Replace IAC.
 Code 42
	
Electronic Spark Timing (EST)
	
Electronic Spark Timing bypass circuit or EST Circuit is grounded or open.  A malfunctioning HEI Module can cause this.
 Code 43
	
Electronic Spark Control
	
ESC retard signal has been on for too long or the system has (ESC) unit failed a functional check.
 Code 44
	
O2 Sensor Indicated Lean
	
Check the ECM Wiring Connections, particularly terminals 15 and 8.  Check for vacuum leakage at the TBI Base gasket, vacuum hoses or the intake manifold gasket.  Replace the Oxygen Sensor.
 Code 45
	
O2 Sensors Indicated Rich
	
Check the Evaporative Charcoal Canister and its components for the exhaust presence of fuel.  Replace the Oxygen Sensor.
 Code 51
	
PROM or MEM-CAL
	
Make sure that the PROM or MEM-CAL is properly installed in the ECM.  Replace the PROM or MEM-CAL.
 Code 52
	
CALPAK
	
Check the CALPAK to insure proper installation.  Replace the CALPAK.
 Code 53
	
System Over Voltage
(Alternator Problem)
	
Check Charging System
 Code 54†
	
Fuel Pump
	
Low Fuel Pump Voltage.  Sets when fuel pump voltage is less than 2 volts when reference pulses are being received.
 Code 54
	
M/C Solenoid
	
Check All Mixture Control Solenoids and ECM wires and connections.  The mixture control solenoid voltage is high at the ECM because of a shorted solenoid circuit and/or faulty ECM.
 Code 55
	
ECM
	
Be sure that the ECM ground connections are tight.  If they are, replace the ECM.
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Last edited by Triaged; 10-01-2006 at 04:27 PM.
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Old 10-01-2006, 07:36 PM   #8 (permalink)
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Apparently I really suck at searching, thanks a lot!!!
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Old 10-01-2006, 08:34 PM   #9 (permalink)
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I figured that...lol. At times I think I have angered the google gods myself.
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Old 10-02-2006, 09:41 AM   #10 (permalink)
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Quite a few sensors/senders feed into the ecm which will almost always set a code if something out of spec. is detected. Temp, O2, Knock, TPS, MAP - just to name a few. As far as the trans, sounds like a low fluid/plugged filter situation or worn bands. Also, make sure the TV cable is hooked up and adjusted properly.
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