Tip & How-To about Isuzu Trooper

Trouble-shooting your Isuzu starter..

Basic operation of a starter:
Your engine's starter motor is an electrical motor that is used to rotate the engine in order to get it to fire up. This motor draws a large amont of current from the battery (in the order of 70 Amps and up). In order to supply power to the starter a solenoid is used, it acts as a switch between the battery and the starter motor. This solenoid also engages the starter gear with the engine's flywheel and disengages it once the engine is started. Because the circuit for the solenoid also draws a heavy current a further relay is needed to control it.
The diagram below shows the electrical layout of the starting system.

  • i : Battery
  • ii : Starter relay(located in the relay box in the engine compartment)
  • iii : Starter solenoid
  • iv : Starter incorporating solenoid and motor.
  • v : Engine
  • vi : Battery earth cable
  • vii : Engine earth cable
  • viii : Ignition fuse
  • ix : Starter fuse
  • x : Solenoid to starter supply cable
  • xi : Ignition switch
  • xii : Starter motor
When the ignition(xi) is turned it supplies power from the battery through fuse (viii) to the starter relay(ii).
The starter relay activates and supplies power to the starter solenoid(iii) via fuse (ix)
The starter solenoid activates and connects power from the battery to the starter via a short cable(x) between the solenoid and starter motor. This allows the starter motor to turn.

General trouble shooting.
Turn the ignition off.
1/ First you need to check that the fuses are intact.
Keep the ignition off. Place the vehicle in Neutral. Chock the wheels and engage the parking brake.
2/ To prove the starter motor, connect power from the battery positive to the cable (x). This must be done with jumper cables. Touch the jumper cable to the connector on the back of the solenoid where cable (x) connects. Take care not to short circuit the jumper cable to the engine or vehicle body. It can be a tight fit and might not always be possible. If you hear the starter motor spin then it is working along with the engine earth cable. If not, connect the negative lead of the jumper cable between the battery and the starter motor body or any other bare piece of metal on the engine and put the positive lead on cable (x) again. If the starter motor does not spin it needs to come out for repair/replacement. If it spins check both the battery earth cable and engine earth cable and repair where nescasary.
3/ Once the starter motor has been proved move on to the solenoid. Remove the thin wire from the solenoid. Using a small piece of wire, connect battery positive to the connector where you just took off the wire. The solenoid should kick in and the starter motor will turn the engine. If the solenoid does not kick in, remove the starter for repair/replacement of the solenoid. If the solenoid kicks in then replace the starter relay.

If the starting circuit still does not operate the fault will be in the wiring. This needs reasonable expertise and if you dont have a voltmeter handy is not advised.
Bear in mind on automatic transmission vehicles there is an additional switch (Mode switch) wired in between the ignition switch and the starter relay. This switch is on the transmission itself and if faulty will not allow the starter to operate even if steps 1 to 3 were successfull. The same goes for the anti theft/immobiliser system.


The following is specifically for Isuzu Trooper and Rodeo :
  • i : Battery
  • ii : Starter relay(located in the relay fuse box in the engine compartment designated X-17)
  • iii : Starter solenoid
  • iv : Starter incorporating solenoid and motor.
  • v : Engine
  • vi : Battery earth cable
  • vii : Engine earth cable
  • viii : 10A Starter fuse C-1(Fuse box: LH footwell on LHD vehicle, RH dash on RHD vehicle)
  • x : Solenoid to starter supply cable
  • xi : Ignition switch
  • xii : Starter motor
  • xiii : 80A Main fusible link FL-1(Relay fuse box)
  • xiv : 50 A Key SW fusible link FL-2(relay fuse box)
  • xv : Mode switch(A/T only - mounted on the side of the transmission) and for 6 cylinder manual transmission engines this is the clutch start switch mounted on the clutch pedal.
  • xvi : Anti theft system
  • B2 : B2 on ignition sitch
  • ST : ST on ignition switch



How to wire a relay

Posted by on

Cars & Trucks Logo

Related Topics:

Related Questions:

1 Answer

Changed the plugs wires and cap and rotor...think I might have screwed the firing order up....no misfire just wont turn over.


the wires to the plugs should not keep the motor from cranking over. If the battery is fully charged the ignition switch should engage the starter. If you think the firing order is wrong you need to determine 1 where is top dead center (the position the motor is in when #1 cylinder is at the top of the compression stroke). 2 what direction does the rotor turn 3 what is the firing order One way to make it easy to rotate the motor is to remove the spark plugs. no compression means no resistance to the starter so the motor should turn over with the key in the start position. If it won't crank over with the plugs out then something is wrong with the starter, battery, starter relay, or ignition switch. I always start with the basics. the battery should have at least 12.5 volts. if it does check the battery terminals. even if the starter is weak you should hear a click when the key is turned to the start position. Once you get the starter to turn over the motor you can tell when the number one cylinder is at top dead center by putting a finger over the spark hole as you crank over. You will feel the compression as the cylinder comes up on the compression stroke. I have used a large socket to slowly turn the motor over and when you are near top dead center you should be able to see the degrees of advance on the timing mark. Set the motor at top dead center then see where the rotor lines up with the wires on the distributor cap. that is where number one cylinder should fire. You then follow around in the direction that the rotor turns and the wires will corispond with the firing order. I always make a mark on the number one spot on the cap with a felt pen. That way you have a fixed reference point. Take care to verify that all the wires are to the proper plugs before trying to start. Take extra care at this point and make sure your firing order and rotor rotation are correct. I would triple check this. The firing order and rotor direction are usually somewhere on the autozone repair web site

Apr 19, 2011 | Jeep Cherokee Cars & Trucks

1 Answer

when I replace the spark plug wires on my 2000 4runner how do make sure that the wires are in the correct order


Okay, on the photos I am posting, pick the size of motor that you have....since you didn't post it. When you find the right photo of your motor, the numbers on the engine correspond to the number of the spark plug that goes to the coil...1 to 1, 2 to 2 and so on. This is your firing order and will ensure you have the proper spark plug firing from the correct point:


1a3d6bb.gif
1FZ-FE engine Firing order: 1–5–3–6–2–4Distributor rotation: counterclockwise


86807a1.gif
5VZ-FE engine Firing order: 1–2–3–4–5–6Distributorless ignition system


fe73fe6.gif
2RZ-FE and 3RZ-FE engines Firing order: 1–3–4–2Distributor rotation: clockwise


ecb67ba.gif
2RZ-FE and 3RZ-FE engines Firing orders: 1–3–4–2Distributorless ignition system


09d7f31.gif
2UZ-FE engines Firing order: 1–8–4–3–6–5–7–2Distributorless ignition system

Aug 12, 2010 | Toyota 4Runner Cars & Trucks

1 Answer

i need a diagram showing the spark plug wires on a ford 302 motor


FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired. Fig. 1: 300 cid (4.9L) inline six-cylinder engines Firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise 85762008.gif
Fig. 2: 232 cid (3.8L) V6 engine Firing order: 1-4-2-5-3-6 Distributor rotation: Counterclockwise 85762006.gif
Fig. 3: 255 cid (4.2L), 302 cid (5.0L), 360 cid (5.9L), 390 cid (6.5L), 460 cid (7.5L) V8 engines Firing order: 1-5-4-2-6-3-7-8 Distributor rotation: Counterclockwise 85762007.gif
Fig. 4: 351 cid W & M (5.8L), 400 (6.6L) engines Firing order: 1-3-7-2-6-5-4-8 Distributor rotation: Counterclockwise 85762009.gif
Fig. 5: 6.9L diesel engines Firing order: 1-2-7-3-4-5-6-8 85762010.gif
prev.gif next.gif

Jul 05, 2010 | 1981 Ford F 150

1 Answer

need firing order diagram for 91 s10 blazer


991 Chevy S10 firing order
The firing order for a Chevy s10 depends on which engine you have.
1.9L engine the firing order is: 1-3-4-2 . Distributor rotates counterclockwise.
2.0L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.5L engine the firing order is: 1-3-4-2 . Distributor rotates clockwise.
2.8L engine the firing order is: 1-2-3-4-5-6 . Distributor rotates clockwise.
4.3L engine the firing order is: 1-6-5-4-3-2 . Distributor rotates clockwise.

Jan 09, 2010 | 1991 Chevrolet S-10

1 Answer

firing order for a 1986 gmc s15


FIRING ORDERS

To avoid confusion, ALWAYS replace spark plug wires one at a time.

The most important thing to remember about the removal and installation of a distributor, cap or spark plug cable is that all wires MUST be labelled before they are disconnected. Keep in mind that these figures depict a firing order where the distributor cap terminals are relative to EACH OTHER only and they do not necessarily depict the tower positions in relation to the rest of the engine. This is true because any distributor which has been removed and reinstalled may have been installed with the No. 1 spark plug tower at any position (360 degrees) in relation to the rest of the motor, as long as the rotor aligned to the No. 1 tower when the No. 1 cylinder was at TDC of the compression stroke (valves closed, ready for the plug to fire). As long as the remaining wires were connected in the correct firing order sequence (depending on direction of distributor rotation) the engine will run. DO NOT EVER remove more than one wire from the distributor cap at a time unless you tag ALL wires and towers to assure proper installation.

db45c9c.jpg

Fig. 1: 1.9L engine . Firing order: 1-3-4-2 . Distributor rotation: counterclockwise

cf6af5d.jpg

Fig. 2: 2.0L engine . Firing order: 1-3-4-2 . Distributor rotation: clockwise

5c33822.jpg

Fig. 3: 2.5L engine . Firing order: 1-3-4-2 . Distributor rotation: clockwise

cae855e.jpg

Fig. 4: 2.8L engine . Firing order: 1-2-3-4-5-6 . Distributor rotation: clockwise

9674e44.jpg

Fig. 5: 4.3L engine. Firing order: 1-6-5-4-3-2 . Distributor rotation: clockwise

I hope help you with this (remember rated this help) Good luck.

Oct 05, 2009 | 1986 GMC C1500

Not finding what you are looking for?

5,469 people viewed this tip

Ask a Question

Usually answered in minutes!

Top Isuzu Experts

yadayada
yadayada

Level 3 Expert

76109 Answers

Steve Hurc
Steve Hurc

Level 3 Expert

450 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Are you an Isuzu Expert? Answer questions, earn points and help others

Answer questions

Loading...