Function Test Mode Active on Platform Controller
What does SKYJACK-61 mean?
The SKYJACK-61 (Skyjack) EV fault code means: Function Test Mode Active on Platform Controller. This is a minor severity code.
Common Symptoms
- Platform LCD on the upper control box displays code 61 continuously
- One or more normal safety cutouts or interlocks are bypassed during operation
- Machine responds to drive or lift commands that would normally be blocked by a cutout
- Tilt alarm or overload cutout may not trigger as expected during travel or lift
- Platform LCD shows READY or RUN state even when a sensor that would normally inhibit function is faulted
- Operators notice the machine behaves differently than it does in normal rental-fleet service
- Code 61 clears on its own when function test mode is exited or power is cycled
Probable Causes (Ranked by Likelihood)
- Function test mode was intentionally activated by a technician using the EZcal or Pcal handheld to bypass interlocks during a bench diagnostic or pre-delivery inspection Very Likely
- A service technician left the controller in function test mode after completing diagnostics and did not exit the mode before returning the machine to service Very Likely
- A wiring harness fault or intermittent short on the diagnostic harness connector tricked the GCON or TCON into latching function test mode at power-up Possible
- Incorrect controller parameter was written to the GCON or TCON during an EZcal / Pcal calibration session, leaving the test-mode flag set in non-volatile memory Possible
- A software bug in an older GCON or TCON firmware version causes the test-mode flag to persist across power cycles without user input Less Likely
Step-by-Step Diagnostic Procedure
Step 1. Before anything else, take the machine out of service. Code 61 means some safety cutouts are bypassed. Do not let operators use the lift until you confirm it is back in normal operating mode.
Step 2. Check the Platform LCD on the upper control box. Note whether code 61 is the only active code or whether additional codes are queued. Write down all active codes before you start clearing anything.
Step 3. Cycle main power OFF, wait 30 seconds, then power back ON. Watch the Platform LCD through the boot sequence. If code 61 does not return, the mode was likely left active by a previous technician and a simple power cycle clears it. Re-test all normal cutouts (tilt, overload, emergency stop) before returning the machine to service.
Step 4. If code 61 returns after a power cycle, connect the Skyjack diagnostic harness and the EZcal / Pcal handheld. Navigate to the function test or service mode menu. Confirm whether the test-mode flag is set to ON. Set it to OFF, save the parameter, and power-cycle again.
Step 5. Inspect the diagnostic harness connector at the lower control box for bent pins, corrosion, or a wiring short that could be pulling the test-mode input line low at startup. Repair any damaged pins or wiring before reconnecting.
Step 6. Using a multimeter set to DC volts, measure the voltage at the diagnostic input pin on the GCON or TCON harness connector with the harness unplugged. You should read battery voltage (nominally 24 V DC on most SJIII models, 48 V DC on larger units). A reading near 0 V with the harness disconnected suggests a short to ground on that circuit. Trace and repair the short.
Step 7. If the flag persists after clearing through EZcal / Pcal and the wiring checks out clean, the GCON or TCON may have a corrupted parameter block. Contact Skyjack technical support for a controller firmware reflash or parameter file restore. This step requires specialty tools and factory-level access.
Step 8. After any repair, functionally test all safety cutouts, including tilt sensor, platform overload, emergency STOP, and pothole protection if equipped, before releasing the machine to the rental fleet.
Frequently Asked Questions
What does Skyjack code 61 mean?
Code 61 means the machine is in function test mode. This is a special service state where the GCON or TCON controller bypasses some normal safety cutouts so a technician can exercise machine functions during diagnostics or pre-delivery inspection. It is not a hardware failure, but the machine should not be used by operators while this code is active.
Can the lift still operate with code 61 showing?
Mechanically yes, but safely no. Some interlocks that are supposed to stop the machine (tilt cutout, overload, or other sensor inputs) may not function normally while code 61 is active. The machine is marked as limited operation. Take it out of service until you confirm all cutouts are working correctly after exiting test mode.
How much does it cost to fix code 61?
If a technician simply left the machine in test mode, exiting function test through the EZcal / Pcal handheld or power-cycling costs nothing. If there is a wiring fault causing the mode to re-enter on its own, expect $20-$80 in wiring parts for a DIY fix. A professional diagnosis and controller reflash runs $150-$600 depending on what is found.
Will code 61 come back after I cycle the power?
Usually not. A simple power cycle clears the function test flag if it was left on accidentally. If code 61 returns every time you power up, there is either a wiring short holding the diagnostic input active or a corrupted parameter in the GCON or TCON that needs to be cleared with the EZcal / Pcal handheld or a controller reflash.