Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2003 Isuzu Axiom Base, 4WDFACTORY OEM SERVICE PROCEDURE
Driveline Control System
- Service Precaution
- General Description
- System Components
- Parts Location
- Front and Rear Speed Sensors
- Electromagnetic Coil
- Multi Plate Disk Clutch Pack
- Mechanical Lock Sleeve
- High-Low Planetary Gear Set
- 4H and 4L Switch
- Transfer Connector (12-Pin Type)
- Transfer Connector (8-Pin Type)
- TOD Indicator Lamps (on the instrument panel)
- High-Low Shift Motor
- Motor Position and Encoder Position Code
- Encode Position Plate
- Shift High Range and Low Range
- Functions Of Tod Switch And Indicator Lamp
- Diagnosis
- Basic Diagnostic Flow Chart
- Parts Location
- Circuit Diagram
- Connector List
- Checking Failed Pin
- Checking Failed Tod Control Unit Pin
- Diagnostic Trouble Codes
- Diagnosis From Trouble Codes
- Trouble Code: 23, 36, 37 & 38 / P1712 & P1714 - Check Flow 1
- Trouble Code: 14 / P1731 - Check Flow 2
- Trouble Code: 24 / P1733 - Check Flow 3
- Trouble Code: 16 / P1737 - Check Flow 4
- Trouble Code: 27 / P1738 - Check Flow 5
- Trouble Code: 13 & 15 / P1735 & P1736 - Check Flow 6
- Trouble Code: 21 / P1716 - Check Flow 7
- Trouble Code: 17 / P1774 - Check Flow 8
- Table 1
- Table 2
- Trouble Code: 31 / P1721 - Check Flow 9
- Trouble Code: 28 / P1760 - Check Flow 10
- Trouble Code: 32 / P1761 - Check Flow 11
- Trouble Code: 33 / P1762 - Check Flow 12
- Trouble Code: 41 & 43 / P1741 & P1743 - Check Flow 13
- Trouble Code: 42 / P1773 - Check Flow 14
- Trouble Code: 55 / P1755 - Check Flow 16
- Table (1) (High Position Standard)
- Table (2) (Low Position Standard)
- Table (3) (High Position Standard)
- Table (4) (low position standard)
- Trouble Diagnosis Depending On The Status Of Tod Indicator
- Notes
- Chart A: Indicator Drive Circuit
- Chart B-1: TOD Switch A Circuit Wires Are Broken Or Short Circuited To The Ground
- Chart B-2: TOD Switch A Circuit Is Shorted To Battery
- Chart B-3: TOD Switch B Circuit Is Shorted To GND Or Broken
- Chart B-4: TOD Switch B Circuit Is Shorted To Battery
- Chart C-1: 4H Switch Circuit Is Short Circuited To GND
- Chart D-1: 4L Switch Circuit Wires Are Broken Or The Battery Circuit Is Short Circuited
- Chart D-2: 4L Switch Circuit Is Short Circuited To GND
- Chart E-1: Axle Switch Circuit Wires Are Broken
- Chart E-2: Axle Switch Circuit Short Is Circuited To GND
- Chart G: Trouble Codes Are Displayed
- Chart H: Lighting Switch Circuit
- Diagnosis From Symptom
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
Comes to youSame-day available12-month warranty
Get a Free QuoteNo obligation. See pricing before you book.